Antenna's are a total science unto themselves. they are one thing that can make or brake a Motorsport communication system. The correct Arial is the most important.
Length and type of antenna makes a huge difference. 

It is important when purchasing an Antenna that the frequency being used by the radios matches the design frequency of the antenna. This can require the asistance of a Radio Engineer, Harris Race Radios are your profesional Radio Engineers.

Harris Race Radios on Supercar

Antennas are used to send and receive frequency signals. Very high frequency (VHF) and ultrahigh frequency (UHF) antennas are designed to transmit and pick up different ranges of frequencies in the broadcast spectrum. ... VHF antennas do not transmit and receive the same channels as UHF antennas.

A VHF antenna will not work on a UHF radio and summarily a UHF arial will not work on a VHF radio.

Harris Race Radios are qualified Radio engineers, if you don't know what is needed get the help of an expert. Ask one of our qualified radio engineers to check you aerial installation with our special Motorola Wattmeter and Bird SWR meter.

 and

 Questions If your not sure ask one of ourradio engineer, at Harris Race Radios, advice is free. 
  1. What is the difference between UHF & VHF Harris Race Radios?
  2. The UHF wave length is generally shorter and works in and around objects such as trees, hills, buildings, etc. VHF works best in line of sight so it's used in aviation, marine and off road environments. For road racing, UHF has a better ability to travel through things, i.e. metal, concrete, trees, etc., it is also less susceptible to interference.
  3. VHF and UHF antennas are different, if you use the incorrect arial the system wont work very well. 
  4. For Motorsport Racing Do I Need An External Roof Mount Antenna? if your not sure Contact Harris Race Radios.
  5. There are (2) different types of systems. 1/ If you have a tin top car you need the standard coax which uses the roof as the ground plane. 2/ If you have a fiberglass or carbon fiber car you will need to use a ground plate under the antenna or a good Ground plane independent arial system, so make sure to order the correct system system with ground plate. General rule of thumb for any radio is, the higher the antenna position, the longer the distance that can be covered. That being said, unless done properly an external antenna may not be better than the existing Antenna on the Radio. For tin top cars, the top of roof is a great location. Some cars can sometimes get away with the antenna on the radio as long as the Radio is positioned high enough with the Antenna pointing up.
  6. As a general rule of thumb use a Harris Race Radios professional ground plane independent external antenna. 
  7. What should I do if I have Extra Coax cable?
  8. Get a radio engineer at Harris Race Radios to make the cable the correct length.
  9. NEVER NEVER NEVER take the extra coax and wrap it up with a zip-tie (Antenna Loop)! Run it around in the car and away from power sources. Keep cable ties loose, a tight cable tie will damage the arial cable.
  10. An often asked question "Our team radios work perfect in the pits but not when the car is on the track" why?" 
  11. 1.See above (antenna loop is the #1 issue we see). Next, make sure the antenna ground is good and you are running the correct antenna setup (tin top vs. fiberglass and UHF vs. VHF).
  12. Check the mic location in helmet kit and crew headset (see Helmet Install). Again, we see this over and over... The mic must be touching your lips!
  13. Check to see if the antenna coax is broken (Ohm Meter) from the Gold tip at the BNC in the car to the roof top removal connection.
  14. VHF is more used in Off Road and Off Shore racing and has a greater range over water and through trees, but not so good through buildings and cars.
  15. How close can we mount two antennas?
  16. With most questions of this nature, there is an easy answer and a not so easy answer. The easy answer is that you should maintain a minimum mounting distance of at least 1/4 wavelength ( about 1 x arial length ) apart for the lowest frequency antenna within the same horizontal plane. For VHF antennas, that translates to roughly 19 inches. In Motorsport on racing cars there is often pressure to mount close as posable,as a rule resist this pressure and consult a radio engineer, Harris Race Radios.


At Harris Race Radios we have developed a special ground plane independent (no need for copper plate), antenna especially suited for Digital Motorsport radios. 

Harris Race radios anntena arial
What is an antenna ground plane?

As the name indicates the antenna ground plane acts as a simulated ground. It is found that for a monopole antenna like a quarter wavelength vertical, the ground acts as a plane to reflect the radio waves so that an image of the top half of the antenna is seen in the Earth. It is possible to simulate this function by replacing the real earth with a conducting plate. To function as an antenna ground plane, the conducting (copper plate )surface must extend for least a quarter wavelength from the base of the antenna.

Vertical antenna (monopole) with solid ground plane
Vertical antenna (monopole) with solid ground plane

In reality it is not necessary to have a full circular conducting plate for a ground plane. This could be difficult to manage but the closer you get the better it works.

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