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CHA EXTRA WIRE

1 X 60' Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

1 X Winder

1 X Stainless Steel Carabiner

or

1 X 130' Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

1 X Winder

1 X Stainless Steel Carabiner

Preview

CHA 250’ WIRE PTFE

Do you want to make your own wire antennas? 

Then get your 250' 16 Gauge Stranded Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire with Winder.

This wire is specially made for us. The CHA PTFE wire is used in high temperature electronic applications or where abrasion resistance is required. It has excellent thermal aging, solder damage, flame, and moisture resistance. PTFE resists solvents, grease, ozone and other chemicals. Low power loss, ideal for high frequency applications. Recommended for critical applications.

$99.00
Preview

CHA 4 PACKS WINDERS

Do you want to create your own wire antennas? 

Then get our pack of 4 winders for $25 USD + FREE SHIPPING USA ONLY. 

For outside USA please email us!

Send us an email: 

support@chameleonantenna.com

$25.00
Preview

CHA EMCOMM II

The CHA EMCOMM II Antenna has been specially designed for backup emergency HF system or permanent installation. The integral broadband impedance matching network (transformer 5:1) allows broadband antenna tuning.


It is the perfect backup antenna for apartments, condominiums, homeowners associations, deed restrictions and CCRs (Covenants, Conditions & Restrictions), ARES, RACES, MARS, EMCOMM, NVIS, First Responders and especially for Emergency Preparedness.


The unit is totally waterproof. The antenna is 60’ long and covers 6M to 160M. An external tuner might be required.


The antenna will perform very well with a sloper or an inverted “L” configuration. For a NVIS configuration (40M – 80M) the antenna must be installed horizontally with the ground and elevated between 9’ and 12’ high.


The CHA EMCOMM II do not required any ground-plane but will perform better with one. A ground terminal is available for that purpose. 

 


Specifications:

Frequency:  6M - 160M

Power: 500W SSB or 250W CW

Length: 60’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

Weight: 2.0 Lb.



The antenna system consists of:

1 X CHA EMCOMM II matching box

1 X 60' Copper Clad KEVLAR Wire


Sloper Installation

The sloper is considered the most unusual antenna system and can be difficult to get to work properly. The sloper may exhibit some gain in one direction, but usually has omni direction pattern. There are two types of sloper, the full sloper, really a dipole mounted with one end higher than the other. The half-sloper (EMCOMM II) is fed at one end with a “ground system” or counter poise provided by either physical ground if fed at lower end of sloper. If the sloper is fed at the top, then other factors provide the “ground”. In most cases, a sloper mounted on a tower, then the tower and importantly, the beam mounted on top, act as the counterpoise.


One successful version of the sloper (most folks call any kind of sloper simply a “sloper” regardless of its type) is one that is fed with coax. The antenna is fed from the top and installed on a tower with a beam on top. The center conductor of the coax feeds the sloper wire and the shield is carefully bonded to the tower structure. In addition the beam, rotor, and mast are electrically bonded to the tower (here a heavy braided strap connecting the mast to the tower is recommended). The theory is that the sloper is fed at the top and the high current point is high just under the beam, leading away from the tower.


The sloper has been reported to be hard to get to work in some cases. When it works, its performance when used with a tower and a beam is very good. Considering the cost of materials (assuming the tower is in place already) the sloper should be considered.


Inverted "L" Installation

This is most likely the least expensive high performance antenna you can erect for 40M, 80M and 160M (limited performance). It is worth investigating since it needs only one high point in the relative clear to be effective (the horizontal far end can be at a lesser elevation, details later).


Most likely you will need to use an external antenna tuner.


The main radiating component of the “L” is the vertical wire, that’s what makes it a very good groundwave and DX antenna. So it would be good if this can be kept in the clear, or several feet away from your tower, and of course, as high as you can make it. The horizontal part may slope downward, or bent several times to accommodate any obstacles. Keep in mind, the more you bend the element back on itself, the more of the radiated signal is canceled out.


Sometimes it is not possible to have the vertical section longer than the horizontal section. This will result in more of the signal being radiated skyward to which NVIS (Near Vertical Incident Skywave) will occur.  NVIS is a propagation method that provides usable signals in the range between ground wave and skywave distances (usually 30 to 400 miles).


Before we go any further, this antenna requires a robust ground system. If your ground is poor, the antenna efficiency will be poor, and you will be troubled with RF in the shack.


The radiation pattern is omni directional, with a possible minor lobe in the direction of the horizontal portion.

$125.00
Preview

CHA EMCOMM III Base

The EMCOMM III Base antenna, is an effective multi-band High Frequency (HF) antenna specially designed for short to long range base station HF communications. Due to configuration and installation flexibility and low visibility design, it is ideal for home use even in developments with a Home Owners Association (HOA) and Covenants, Conditions, and Restrictions (CCRs). It is also highly suitable for military, government agencies, non-governmental organizations (NGOs), Military Affiliate Radio System (MARS), Civil Air Patrol (CAP), Amateur Radio Emergency Service (ARES) / Radio Amateur Civil Emergency Service (RACES), Salvation Army Team Emergency Radio Network (SATERN), and shortwave listening.


The EMCOMM III Base antenna is configurable to facilitate both long distance (DX) and Near-Vertical Incident Sky wave (NVIS) communication and using an automatic antenna tuner or coupler with memory settings will support most Automatic Link Establishment (ALE), frequency-hopping, and spread- spectrum modes and operations.


SWR: Subject to frequency and configuration, but typically less than 2.7:1. An antenna tuner or coupler may be required depending upon frequency and configuration.


The EMCOMM III Base antenna can be installed by the operator in less than 30 minutes. It should be installed as high and straight as possible, but almost any available supports, such as an existing antenna tower, trees, a flag pole, the eaves of a house, or a non-conductive fence can be used with satisfactory results.


The EMCOMM III Base antenna is comprised of a matching transformer and a 130 foot antenna wire on a line winder - making an effective HF base station antenna system for permanent installation as a primary or backup HF base station antenna.


Specifications:

Frequency:  10M - 80M

Power: 500W SSB or 250W CW

Length: 130’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

Weight: 2.2 Lb.


The antenna system consists of:

1 X CHA EMCOMM III matching box

1 X 130' Copper Clad KEVLAR Wire


Sloper Installation

The sloper is considered the most unusual antenna system and can be difficult to get to work properly. The sloper may exhibit some gain in one direction, but usually has omni direction pattern. There are two types of sloper, the full sloper, really a dipole mounted with one end higher than the other. The half-sloper (EMCOMM III BASE) is fed at one end with a “ground system” or counter poise provided by either physical ground if fed at lower end of sloper. If the sloper is fed at the top, then other factors provide the “ground”. In most cases, a sloper mounted on a tower, then the tower and importantly, the beam mounted on top, act as the counterpoise.


One successful version of the sloper (most folks call any kind of sloper simply a “sloper” regardless of its type) is one that is fed with coax. The antenna is fed from the top and installed on a tower with a beam on top. The center conductor of the coax feeds the sloper wire and the shield is carefully bonded to the tower structure. In addition the beam, rotor, and mast are electrically bonded to the tower (here a heavy braided strap connecting the mast to the tower is recommended). The theory is that the sloper is fed at the top and the high current point is high just under the beam, leading away from the tower.


The sloper has been reported to be hard to get to work in some cases. When it works, its performance when used with a tower and a beam is very good. Considering the cost of materials (assuming the tower is in place already) the sloper should be considered.


Inverted "L" Installation

This is most likely the least expensive high performance antenna you can erect for 40M, 80M and 160M (limited performance). It is worth investigating since it needs only one high point in the relative clear to be effective (the horizontal far end can be at a lesser elevation, details later).


Most likely you will need to use an external antenna tuner.


The main radiating component of the “L” is the vertical wire, that’s what makes it a very good groundwave and DX antenna. So it would be good if this can be kept in the clear, or several feet away from your tower, and of course, as high as you can make it. The horizontal part may slope downward, or bent several times to accommodate any obstacles. Keep in mind, the more you bend the element back on itself, the more of the radiated signal is canceled out.


Sometimes it is not possible to have the vertical section longer than the horizontal section. This will result in more of the signal being radiated skyward to which NVIS (Near Vertical Incident Skywave) will occur.  NVIS is a propagation method that provides usable signals in the range between ground wave and skywave distances (usually 30 to 400 miles).


Before we go any further, this antenna requires a robust ground system. If your ground is poor, the antenna efficiency will be poor, and you will be troubled with RF in the shack.


The radiation pattern is omni directional, with a possible minor lobe in the direction of the horizontal portion.

$149.00
Preview

CHA EMCOMM III Portable

The EMCOMM III Portable antenna is a portable High Frequency (HF) antenna specially designed for short to long range portable and man-pack HF communications. The EMCOMM III Portable antenna is ideal for hiking, backpacking, and both tent and Recreational Vehicle (RV) camping. It is also highly suitable for military, government agencies, non- governmental organizations (NGOs), Military Affiliate Radio System (MARS), Civil Air Patrol (CAP), Amateur Radio Emergency Service (ARES) / Radio Amateur Civil Emergency Service (RACES), Salvation Army Team Emergency Radio Network (SATERN), and amateur radio operators (hams) involved in field communication and disaster preparedness.


The EMCOMM III Portable antenna is configurable to facilitate Near-Vertical Incident Sky wave (NVIS) communication and will support most Automatic Link Establishment (ALE), frequency-hopping, and spread- spectrum modes and operations. An antenna tuner or coupler may be required for in some instances. The EMCOMM III Portable antenna can be deployed by the operator in the field in less than 15 minutes, using almost any available support, with no masts or guying required.


The EMCOMM III Portable antenna is comprised of a matching transformer, a 73 foot antenna wire on a line winder, and a 25 foot counterpoise - making a highly portable and effective HF antenna system.


Specifications:

Frequency:  10M - 160M

Power: 100W SSB or 50W CW

Length: 73’ + 25" Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

Weight: 1.5 Lb.


The antenna system consists of:

1 X CHA EMCOMM III matching box

1 X 73' Copper Clad KEVLAR Wire (Radiator)

1 X 25' Copper Clad KEVLAR Wire (Counterpoise)


Inverted “L” / Sloping Wire Configurations

The EMCOMM III Portable antenna, Inverted “L” and Sloping Wire configurations, see figure (1), are medium to long range HF antennas. They should provide acceptable ground wave and sky wave propagation. The Inverted “L” and Sloping Wire configurations are excellent general-purpose antennas and are a good choice when two supports are available (for the Inverted “L”) or one support (for the Sloping Wire) and there is sufficient time for site selection and installation. Installing the antenna at a height of around 25 feet or higher will provide good performance. These configurations are predominately omnidirectional on lower frequencies, slightly favoring the end of the antenna on upper frequencies.


End-Fed Inverted “V”

The EMCOMM III Portable antenna End-Fed Inverted “V” configuration, see figure (1), is a medium range HF antenna. The End-Fed Inverted “V” is a good compromise between performance and ease of installation since it requires only one center support, has a reasonably small foot-print, and provides good sky wave propagation. The center should be mounted at a height of around 25 feet and when mounted at this height, the antenna will be omnidirectional at lower frequencies and predominately bidirectional broadside to the antenna on upper frequencies.


Horizontal End-Fed (NVIS)

The EMCOMM III Portable antenna Horizontal End-Fed (NVIS) configuration, see figure (3), is a short to medium range HF antenna. The Horizontal End-Fed configuration will provide good NVIS propagation on lower frequencies and medium range sky wave propagation on upper frequencies. It requires two supports and should be mounted at a height of around 25 feet for good overall results. When mounted at this height, the antenna is omni-directional on the lower frequencies and predominantly bidirectional towards the ends of the antenna on the upper frequencies.


$139.00
Preview

CHA SKYLOOP

The CHA SKYLOOP is an extreme performance horizontal full-wave loop antenna. The main advantages of a horizontal loop antenna are reduced background noise and a better gain over a dipole—which means signals will be stronger. In fact, most operators can’t believe the increase in performance over their old dipole antenna. The antenna is comprised of 250 feet of wire, insulators, and a matching transformer unit. The integral broadband impedance matching network transformer allows broadband antenna tuning. The antenna will operate from 3.5 - 54 MHz (including 80m – 6m amateur bands) without any adjustment with a wide range antenna tuner.


The CHA SKYLOOP is a 250' (16 gauge) full wave loop antenna cut for 80M. A yard of at least 60' X 60' will be required to install and support the antenna properly.


With the help of an antenna tuner the CHA SKYLOOP will cover all the bands between 80M and 6M included. 


To match the loop to the coax cable a high power 4:1 air core balun (1000W CW) has been inserted in a waterproof container at the feeding point of the antenna.


Even if the antenna can be installed at a minimum of 10' above ground the antenna should be ideally installed at least 30' to 40' off the ground for maximum performance. The antenna will be suspended by four evenly spaced support points.


The main advantages of a sky loop are the reduced background noise and a better  gain over a dipole. A minimum coax length of 25' of RG-8X (or better) is recommended.


Installation & Performance


     
  • The skyloop can be attached to poles, trees, buildings and whatever is convenient. It is best of course to try to avoid running it with a leg parallel to nearby power lines.


     
  • The feed line should hang away from the antenna wire at as close to a 90 degree angle as possible to prevent coupling of the feed line to the antenna wire.  


     
  • The skyloop is an efficient antenna omni-directional over most real earth and exhibits a good signal-to-noise ratio.


     
  • The antenna operates on all bands (harmonics) above the design or fundamental frequency.


     
  • Successful local and DX operation can be made when the antenna is elevated at least 20' above ground but the higher the better.


     
  • The larger the area or aperture inside the loop the better.


     
  • Usually the skyloop will perform about 80% to 90% better than a G5RV or dipole at the same elevation. 


     
  • Occasionally a DX station might fall into one of the nulls (as frequency increases, a loop will have nice gain lobes but also corresponding sharp nulls).


     
  • The skyloop ignores a lot of both manmade and natural noise while still reaching out and grabbing RF signals effectively.


     
  • The gain of the skyloop at its fundamental frequency is approximately 1.8 dB over a dipole.

 

Specifications:


Frequency:  6M - 80M

Power: 1000W CW

Length: 250' Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

The antenna system consists of:



1 X CHA SKYLOOP matching unit

1 X 250’ Copper Clad KEVLAR Wire


$179.00
Preview

CHA TD (Tactical Dipole)

The CHA TD (Tactical Dipole) is a HF broadband antenna specially designed for portable HF communication where rapid deployment and simplicity of operation is essential. 


The antenna will operate at all frequencies in the 1.8-30 MHz band without any adjustment with most modern internal antenna tuners. It is ideal for use in conjunction with modern, digitally configured, HF communication transceivers where features such as ALE and frequency hopping require true broadband capability. No masts or guying are required.


The CHA TD can also be used without antenna tuner, as the SWR will stay under 2.5:1 between 10M and 80M and under 2.75:1 on 160M.


The antenna will work successfully supported by trees, masts, the tops of vehicles or any convenient object or structure. The antenna works most effectively when elevated at a reasonable height, but if no support is available it will also radiate (with limited efficiency) when stretched out on the ground.


The radiation pattern of the antenna has significant vertical component at all frequencies, making it ideal for NVIS applications.


The antenna system consists of:


2 X 60’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire (Antenna)

2 X 25’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire(Counterpoises)

2 X 300 Ohm Termination Resistors (300W SSB or 100W CW)

1 X 50’ Paracord 550

4 X Tent Stakes

1 X 50’ RG-58 (PL-259 connectors) & Integrated RFI Choke

1 X Bag

1 X EMCOMM II Transformer Unit

All Stainless Steel Hardware

$399.00
Preview

CHA TD Lite

The CHA TD LITE (Tactical Dipole LITE) is a HF broadband antenna specially designed for portable HF communication where rapid deployment and simplicity of operation is essential but compactness is primordial.


The antenna will operate at all frequencies in the 1.8-54 MHz band without any adjustment with most modern external antenna tuners. No masts or guying are required.


The antenna will work successfully supported by trees, masts, the tops of vehicles or any convenient object or structure. The antenna works most effectively when elevated at a reasonable height, but if no support is available it will also radiate (with limited efficiency) when stretched out on the ground.


The radiation pattern of the antenna has a significant vertical component at all frequencies, making it ideal for NVIS applications.


The antenna system consists of:


1 X EMCOMM II TRANSFORMER

2 X 60’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

2 X Tent Stakes

1 X Bag

All Stainless Steel Hardware


Specifications:

Frequency: 6M – 160M

Power: 500W SSB or 250W CW

$140.00
Preview

CHA WINDOM 40

The CHA WINDOM 40 antenna is designed for 40m, 20m & 10m. A tuner may be needed to tune the other bands between 80M and 6M. Power handling is 250W SSB. Built with the portable user in mind. Very light weight. Does not require an antenna tuner under normal circumstances. SWR is < 2:0 (Typically a 1:3 to 1:6 ) at about 35' to 45'. The antenna SWR is influenced by the balun elevation, wires angle, feed-line length and structures proximity.


The following SWR chart shows the SWR curves of the CHA WINDOM 40 elevated at about 10' of elevation and installed in an inverted "V" configuration. A RigExpert AA-520 and a 50' long RG-8X coax cable were used. The SWR will be influenced by the antenna elevation, the angle between the two legs and by the coax length and type.Antenna total length is 66'. Antenna wire elements are #16 proprietary stranded wire (short side is 22' (6.7m) long and longer side is 44' (13.4m) long). Built with a 5:1 250W SSB balun mounted on a polycarbonate plate. A 10’ of paracord 550 has been added at each ends of the antenna and another 20’ to secure the balun.


The antenna system consists of:


1 X CHA WINDOM 40

1 X Tactical MOLLE Pouch


$165.00
Preview

CHA EXTRA WIRE

1 X 60' Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

1 X Winder

1 X Stainless Steel Carabiner

or

1 X 130' Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

1 X Winder

1 X Stainless Steel Carabiner

Read More
View All Products

CHA 250’ WIRE PTFE

$99.00

Do you want to make your own wire antennas? 

Then get your 250' 16 Gauge Stranded Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire with Winder.

This wire is specially made for us. The CHA PTFE wire is used in high temperature electronic applications or where abrasion resistance is required. It has excellent thermal aging, solder damage, flame, and moisture resistance. PTFE resists solvents, grease, ozone and other chemicals. Low power loss, ideal for high frequency applications. Recommended for critical applications.

Read More
View All Products

CHA 4 PACKS WINDERS

$25.00

Do you want to create your own wire antennas? 

Then get our pack of 4 winders for $25 USD + FREE SHIPPING USA ONLY. 

For outside USA please email us!

Send us an email: 

support@chameleonantenna.com

Read More
View All Products

CHA EMCOMM II

1.8-54 MHz

$125.00

The CHA EMCOMM II Antenna has been specially designed for backup emergency HF system or permanent installation. The integral broadband impedance matching network (transformer 5:1) allows broadband antenna tuning.


It is the perfect backup antenna for apartments, condominiums, homeowners associations, deed restrictions and CCRs (Covenants, Conditions & Restrictions), ARES, RACES, MARS, EMCOMM, NVIS, First Responders and especially for Emergency Preparedness.


The unit is totally waterproof. The antenna is 60’ long and covers 6M to 160M. An external tuner might be required.


The antenna will perform very well with a sloper or an inverted “L” configuration. For a NVIS configuration (40M – 80M) the antenna must be installed horizontally with the ground and elevated between 9’ and 12’ high.


The CHA EMCOMM II do not required any ground-plane but will perform better with one. A ground terminal is available for that purpose. 

 


Specifications:

Frequency:  6M - 160M

Power: 500W SSB or 250W CW

Length: 60’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

Weight: 2.0 Lb.



The antenna system consists of:

1 X CHA EMCOMM II matching box

1 X 60' Copper Clad KEVLAR Wire


Sloper Installation

The sloper is considered the most unusual antenna system and can be difficult to get to work properly. The sloper may exhibit some gain in one direction, but usually has omni direction pattern. There are two types of sloper, the full sloper, really a dipole mounted with one end higher than the other. The half-sloper (EMCOMM II) is fed at one end with a “ground system” or counter poise provided by either physical ground if fed at lower end of sloper. If the sloper is fed at the top, then other factors provide the “ground”. In most cases, a sloper mounted on a tower, then the tower and importantly, the beam mounted on top, act as the counterpoise.


One successful version of the sloper (most folks call any kind of sloper simply a “sloper” regardless of its type) is one that is fed with coax. The antenna is fed from the top and installed on a tower with a beam on top. The center conductor of the coax feeds the sloper wire and the shield is carefully bonded to the tower structure. In addition the beam, rotor, and mast are electrically bonded to the tower (here a heavy braided strap connecting the mast to the tower is recommended). The theory is that the sloper is fed at the top and the high current point is high just under the beam, leading away from the tower.


The sloper has been reported to be hard to get to work in some cases. When it works, its performance when used with a tower and a beam is very good. Considering the cost of materials (assuming the tower is in place already) the sloper should be considered.


Inverted "L" Installation

This is most likely the least expensive high performance antenna you can erect for 40M, 80M and 160M (limited performance). It is worth investigating since it needs only one high point in the relative clear to be effective (the horizontal far end can be at a lesser elevation, details later).


Most likely you will need to use an external antenna tuner.


The main radiating component of the “L” is the vertical wire, that’s what makes it a very good groundwave and DX antenna. So it would be good if this can be kept in the clear, or several feet away from your tower, and of course, as high as you can make it. The horizontal part may slope downward, or bent several times to accommodate any obstacles. Keep in mind, the more you bend the element back on itself, the more of the radiated signal is canceled out.


Sometimes it is not possible to have the vertical section longer than the horizontal section. This will result in more of the signal being radiated skyward to which NVIS (Near Vertical Incident Skywave) will occur.  NVIS is a propagation method that provides usable signals in the range between ground wave and skywave distances (usually 30 to 400 miles).


Before we go any further, this antenna requires a robust ground system. If your ground is poor, the antenna efficiency will be poor, and you will be troubled with RF in the shack.


The radiation pattern is omni directional, with a possible minor lobe in the direction of the horizontal portion.

Read More
View All Products

CHA EMCOMM III Base

3.5-30 MHz

$149.00

The EMCOMM III Base antenna, is an effective multi-band High Frequency (HF) antenna specially designed for short to long range base station HF communications. Due to configuration and installation flexibility and low visibility design, it is ideal for home use even in developments with a Home Owners Association (HOA) and Covenants, Conditions, and Restrictions (CCRs). It is also highly suitable for military, government agencies, non-governmental organizations (NGOs), Military Affiliate Radio System (MARS), Civil Air Patrol (CAP), Amateur Radio Emergency Service (ARES) / Radio Amateur Civil Emergency Service (RACES), Salvation Army Team Emergency Radio Network (SATERN), and shortwave listening.


The EMCOMM III Base antenna is configurable to facilitate both long distance (DX) and Near-Vertical Incident Sky wave (NVIS) communication and using an automatic antenna tuner or coupler with memory settings will support most Automatic Link Establishment (ALE), frequency-hopping, and spread- spectrum modes and operations.


SWR: Subject to frequency and configuration, but typically less than 2.7:1. An antenna tuner or coupler may be required depending upon frequency and configuration.


The EMCOMM III Base antenna can be installed by the operator in less than 30 minutes. It should be installed as high and straight as possible, but almost any available supports, such as an existing antenna tower, trees, a flag pole, the eaves of a house, or a non-conductive fence can be used with satisfactory results.


The EMCOMM III Base antenna is comprised of a matching transformer and a 130 foot antenna wire on a line winder - making an effective HF base station antenna system for permanent installation as a primary or backup HF base station antenna.


Specifications:

Frequency:  10M - 80M

Power: 500W SSB or 250W CW

Length: 130’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

Weight: 2.2 Lb.


The antenna system consists of:

1 X CHA EMCOMM III matching box

1 X 130' Copper Clad KEVLAR Wire


Sloper Installation

The sloper is considered the most unusual antenna system and can be difficult to get to work properly. The sloper may exhibit some gain in one direction, but usually has omni direction pattern. There are two types of sloper, the full sloper, really a dipole mounted with one end higher than the other. The half-sloper (EMCOMM III BASE) is fed at one end with a “ground system” or counter poise provided by either physical ground if fed at lower end of sloper. If the sloper is fed at the top, then other factors provide the “ground”. In most cases, a sloper mounted on a tower, then the tower and importantly, the beam mounted on top, act as the counterpoise.


One successful version of the sloper (most folks call any kind of sloper simply a “sloper” regardless of its type) is one that is fed with coax. The antenna is fed from the top and installed on a tower with a beam on top. The center conductor of the coax feeds the sloper wire and the shield is carefully bonded to the tower structure. In addition the beam, rotor, and mast are electrically bonded to the tower (here a heavy braided strap connecting the mast to the tower is recommended). The theory is that the sloper is fed at the top and the high current point is high just under the beam, leading away from the tower.


The sloper has been reported to be hard to get to work in some cases. When it works, its performance when used with a tower and a beam is very good. Considering the cost of materials (assuming the tower is in place already) the sloper should be considered.


Inverted "L" Installation

This is most likely the least expensive high performance antenna you can erect for 40M, 80M and 160M (limited performance). It is worth investigating since it needs only one high point in the relative clear to be effective (the horizontal far end can be at a lesser elevation, details later).


Most likely you will need to use an external antenna tuner.


The main radiating component of the “L” is the vertical wire, that’s what makes it a very good groundwave and DX antenna. So it would be good if this can be kept in the clear, or several feet away from your tower, and of course, as high as you can make it. The horizontal part may slope downward, or bent several times to accommodate any obstacles. Keep in mind, the more you bend the element back on itself, the more of the radiated signal is canceled out.


Sometimes it is not possible to have the vertical section longer than the horizontal section. This will result in more of the signal being radiated skyward to which NVIS (Near Vertical Incident Skywave) will occur.  NVIS is a propagation method that provides usable signals in the range between ground wave and skywave distances (usually 30 to 400 miles).


Before we go any further, this antenna requires a robust ground system. If your ground is poor, the antenna efficiency will be poor, and you will be troubled with RF in the shack.


The radiation pattern is omni directional, with a possible minor lobe in the direction of the horizontal portion.

Read More
View All Products

CHA EMCOMM III Portable

1.8-30 MHz

$139.00

The EMCOMM III Portable antenna is a portable High Frequency (HF) antenna specially designed for short to long range portable and man-pack HF communications. The EMCOMM III Portable antenna is ideal for hiking, backpacking, and both tent and Recreational Vehicle (RV) camping. It is also highly suitable for military, government agencies, non- governmental organizations (NGOs), Military Affiliate Radio System (MARS), Civil Air Patrol (CAP), Amateur Radio Emergency Service (ARES) / Radio Amateur Civil Emergency Service (RACES), Salvation Army Team Emergency Radio Network (SATERN), and amateur radio operators (hams) involved in field communication and disaster preparedness.


The EMCOMM III Portable antenna is configurable to facilitate Near-Vertical Incident Sky wave (NVIS) communication and will support most Automatic Link Establishment (ALE), frequency-hopping, and spread- spectrum modes and operations. An antenna tuner or coupler may be required for in some instances. The EMCOMM III Portable antenna can be deployed by the operator in the field in less than 15 minutes, using almost any available support, with no masts or guying required.


The EMCOMM III Portable antenna is comprised of a matching transformer, a 73 foot antenna wire on a line winder, and a 25 foot counterpoise - making a highly portable and effective HF antenna system.


Specifications:

Frequency:  10M - 160M

Power: 100W SSB or 50W CW

Length: 73’ + 25" Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

Weight: 1.5 Lb.


The antenna system consists of:

1 X CHA EMCOMM III matching box

1 X 73' Copper Clad KEVLAR Wire (Radiator)

1 X 25' Copper Clad KEVLAR Wire (Counterpoise)


Inverted “L” / Sloping Wire Configurations

The EMCOMM III Portable antenna, Inverted “L” and Sloping Wire configurations, see figure (1), are medium to long range HF antennas. They should provide acceptable ground wave and sky wave propagation. The Inverted “L” and Sloping Wire configurations are excellent general-purpose antennas and are a good choice when two supports are available (for the Inverted “L”) or one support (for the Sloping Wire) and there is sufficient time for site selection and installation. Installing the antenna at a height of around 25 feet or higher will provide good performance. These configurations are predominately omnidirectional on lower frequencies, slightly favoring the end of the antenna on upper frequencies.


End-Fed Inverted “V”

The EMCOMM III Portable antenna End-Fed Inverted “V” configuration, see figure (1), is a medium range HF antenna. The End-Fed Inverted “V” is a good compromise between performance and ease of installation since it requires only one center support, has a reasonably small foot-print, and provides good sky wave propagation. The center should be mounted at a height of around 25 feet and when mounted at this height, the antenna will be omnidirectional at lower frequencies and predominately bidirectional broadside to the antenna on upper frequencies.


Horizontal End-Fed (NVIS)

The EMCOMM III Portable antenna Horizontal End-Fed (NVIS) configuration, see figure (3), is a short to medium range HF antenna. The Horizontal End-Fed configuration will provide good NVIS propagation on lower frequencies and medium range sky wave propagation on upper frequencies. It requires two supports and should be mounted at a height of around 25 feet for good overall results. When mounted at this height, the antenna is omni-directional on the lower frequencies and predominantly bidirectional towards the ends of the antenna on the upper frequencies.


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CHA SKYLOOP

3.0-54 MHz

$179.00

The CHA SKYLOOP is an extreme performance horizontal full-wave loop antenna. The main advantages of a horizontal loop antenna are reduced background noise and a better gain over a dipole—which means signals will be stronger. In fact, most operators can’t believe the increase in performance over their old dipole antenna. The antenna is comprised of 250 feet of wire, insulators, and a matching transformer unit. The integral broadband impedance matching network transformer allows broadband antenna tuning. The antenna will operate from 3.5 - 54 MHz (including 80m – 6m amateur bands) without any adjustment with a wide range antenna tuner.


The CHA SKYLOOP is a 250' (16 gauge) full wave loop antenna cut for 80M. A yard of at least 60' X 60' will be required to install and support the antenna properly.


With the help of an antenna tuner the CHA SKYLOOP will cover all the bands between 80M and 6M included. 


To match the loop to the coax cable a high power 4:1 air core balun (1000W CW) has been inserted in a waterproof container at the feeding point of the antenna.


Even if the antenna can be installed at a minimum of 10' above ground the antenna should be ideally installed at least 30' to 40' off the ground for maximum performance. The antenna will be suspended by four evenly spaced support points.


The main advantages of a sky loop are the reduced background noise and a better  gain over a dipole. A minimum coax length of 25' of RG-8X (or better) is recommended.


Installation & Performance


     
  • The skyloop can be attached to poles, trees, buildings and whatever is convenient. It is best of course to try to avoid running it with a leg parallel to nearby power lines.


     
  • The feed line should hang away from the antenna wire at as close to a 90 degree angle as possible to prevent coupling of the feed line to the antenna wire.  


     
  • The skyloop is an efficient antenna omni-directional over most real earth and exhibits a good signal-to-noise ratio.


     
  • The antenna operates on all bands (harmonics) above the design or fundamental frequency.


     
  • Successful local and DX operation can be made when the antenna is elevated at least 20' above ground but the higher the better.


     
  • The larger the area or aperture inside the loop the better.


     
  • Usually the skyloop will perform about 80% to 90% better than a G5RV or dipole at the same elevation. 


     
  • Occasionally a DX station might fall into one of the nulls (as frequency increases, a loop will have nice gain lobes but also corresponding sharp nulls).


     
  • The skyloop ignores a lot of both manmade and natural noise while still reaching out and grabbing RF signals effectively.


     
  • The gain of the skyloop at its fundamental frequency is approximately 1.8 dB over a dipole.

 

Specifications:


Frequency:  6M - 80M

Power: 1000W CW

Length: 250' Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

The antenna system consists of:



1 X CHA SKYLOOP matching unit

1 X 250’ Copper Clad KEVLAR Wire


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CHA TD (Tactical Dipole)

1.8-30 MHz

$399.00

The CHA TD (Tactical Dipole) is a HF broadband antenna specially designed for portable HF communication where rapid deployment and simplicity of operation is essential. 


The antenna will operate at all frequencies in the 1.8-30 MHz band without any adjustment with most modern internal antenna tuners. It is ideal for use in conjunction with modern, digitally configured, HF communication transceivers where features such as ALE and frequency hopping require true broadband capability. No masts or guying are required.


The CHA TD can also be used without antenna tuner, as the SWR will stay under 2.5:1 between 10M and 80M and under 2.75:1 on 160M.


The antenna will work successfully supported by trees, masts, the tops of vehicles or any convenient object or structure. The antenna works most effectively when elevated at a reasonable height, but if no support is available it will also radiate (with limited efficiency) when stretched out on the ground.


The radiation pattern of the antenna has significant vertical component at all frequencies, making it ideal for NVIS applications.


The antenna system consists of:


2 X 60’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire (Antenna)

2 X 25’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire(Counterpoises)

2 X 300 Ohm Termination Resistors (300W SSB or 100W CW)

1 X 50’ Paracord 550

4 X Tent Stakes

1 X 50’ RG-58 (PL-259 connectors) & Integrated RFI Choke

1 X Bag

1 X EMCOMM II Transformer Unit

All Stainless Steel Hardware

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CHA TD Lite

1.8-54 MHz

$140.00

The CHA TD LITE (Tactical Dipole LITE) is a HF broadband antenna specially designed for portable HF communication where rapid deployment and simplicity of operation is essential but compactness is primordial.


The antenna will operate at all frequencies in the 1.8-54 MHz band without any adjustment with most modern external antenna tuners. No masts or guying are required.


The antenna will work successfully supported by trees, masts, the tops of vehicles or any convenient object or structure. The antenna works most effectively when elevated at a reasonable height, but if no support is available it will also radiate (with limited efficiency) when stretched out on the ground.


The radiation pattern of the antenna has a significant vertical component at all frequencies, making it ideal for NVIS applications.


The antenna system consists of:


1 X EMCOMM II TRANSFORMER

2 X 60’ Copper Clad KEVLAR PTFE (Teflon) (-70°C to 150°C) wire

2 X Tent Stakes

1 X Bag

All Stainless Steel Hardware


Specifications:

Frequency: 6M – 160M

Power: 500W SSB or 250W CW

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CHA WINDOM 40

7.0-29.7 MHz

$165.00

The CHA WINDOM 40 antenna is designed for 40m, 20m & 10m. A tuner may be needed to tune the other bands between 80M and 6M. Power handling is 250W SSB. Built with the portable user in mind. Very light weight. Does not require an antenna tuner under normal circumstances. SWR is < 2:0 (Typically a 1:3 to 1:6 ) at about 35' to 45'. The antenna SWR is influenced by the balun elevation, wires angle, feed-line length and structures proximity.


The following SWR chart shows the SWR curves of the CHA WINDOM 40 elevated at about 10' of elevation and installed in an inverted "V" configuration. A RigExpert AA-520 and a 50' long RG-8X coax cable were used. The SWR will be influenced by the antenna elevation, the angle between the two legs and by the coax length and type.Antenna total length is 66'. Antenna wire elements are #16 proprietary stranded wire (short side is 22' (6.7m) long and longer side is 44' (13.4m) long). Built with a 5:1 250W SSB balun mounted on a polycarbonate plate. A 10’ of paracord 550 has been added at each ends of the antenna and another 20’ to secure the balun.


The antenna system consists of:


1 X CHA WINDOM 40

1 X Tactical MOLLE Pouch


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