ACCESSORIES · ANTENNAS
Choose radio antennas for handhelds, vehicles and repeaters: gain, cable loss, connectors and 400–470 MHz tuning.
Quick answer
The antenna is the part of the radio system that turns electrical power into a radio wave. It is also the part most often chosen last, after the radio and the repeater. That is backwards: a good radio with a poor antenna can underperform a modest radio with a good antenna.
This page covers the antenna types, the gain-versus-loss trade-off and the installation details that decide whether the coverage plan survives contact with the building.
| Type | Best for | Key trade-off | Typical users | Install note |
|---|---|---|---|---|
| Stubby handheld antenna | Compact handhelds | Short and convenient; lower gain | Hotel, retail, office | Keep the original connector and length |
| Whip handheld antenna | Longer range on foot | Longer; can snag | Security, site teams | Use a flexible whip, not a rigid rod |
| Vehicle antenna | Cars, trucks, forklifts | Needs a ground plane and a clean mount | Fleets and drivers | Avoid mounting next to metal structures |
| Base / repeater antenna | Rooftop or mast coverage | High gain; needs a stable mast | Hotels, campuses, repeater sites | Plan the cable route and lightning protection |
| Portable repeater antenna | Temporary sites and events | Quick to deploy; lower height | Construction, events | Use a mast or tripod, not a fence post |
| Radio / system | Typical connector | Note |
|---|---|---|
| Analog handheld | SMA / BNC | Confirm male/female and band |
| DMR handheld | SMA | Keep the original antenna for IP rating |
| Vehicle radio | SO-239 / N-type | Use low-loss coax and a proper ground |
| Repeater / base | N-type | Plan duplexer, cable and lightning protection |
| PoC terminal | Internal antenna | Do not open or modify the housing |
A mismatched antenna can damage the transmitter. Confirm the band and connector before powering up.
Doubling transmitter power adds about 3 dB. Raising the antenna above the clutter, or replacing a lossy cable with a low-loss one, can add far more. The antenna is also the only part of the system that shapes where the energy goes.
A high-gain antenna concentrates energy in a direction. If the coverage area is below the antenna or behind it, a high-gain model can be worse than a simple omni antenna.
Every metre of coax loses signal. A 6 dB gain antenna connected with 5 dB of cable loss delivers only about 1 dB more than a 0 dB antenna with the same cable. At UHF, thin cable loses more, so the cable choice can matter as much as the antenna.
Calculate the system: antenna gain minus cable loss minus connector loss. A modest antenna with short, thick coax often beats a high-gain antenna with a long, thin cable.
For a vehicle antenna, the ground plane and mount matter as much as the antenna. A magnetic mount on a plastic panel or next to a roof rack performs poorly. For a base antenna, the mast height, cable route, grounding and lightning protection are part of the design.
For a handheld, use the original antenna unless the replacement is approved for the model and band. A longer antenna can improve range, but it can also damage the connector or compromise the IP rating.
The most common mistakes are using a VHF antenna on a UHF radio, choosing gain without calculating cable loss, mounting a base antenna too low, and using a damaged coax with water ingress. Each one can make a well-designed system look broken.
Test the antenna and cable before the final installation. A simple SWR check catches a bad connector or a damaged cable before it becomes a coverage complaint.
Click a question to see the answer
Sometimes, if it is approved for the model and band. A longer antenna can improve range, but it can also damage the connector or compromise the IP rating. Test before rolling it out.
No. Gain concentrates energy in a direction. If the coverage area is outside that pattern, a high-gain antenna can be worse than a simple omni. Cable loss also reduces the benefit.
It depends on the radio or repeater: SMA, BNC, N-type or SO-239 are common. Confirm the type and gender before ordering; a wrong connector stops the installation.
No. The antenna must be tuned to the band. A mismatched antenna can damage the transmitter and will perform poorly.
Very. At UHF, thin or long coax can lose more signal than the antenna gain adds. Use low-loss cable and keep the run as short as practical.
For a rooftop or mast antenna, yes. Plan grounding and surge protection as part of the installation, especially in areas with frequent storms.
Send the site size, number of users and talk groups. Our engineers reply within one working day with a workable configuration.
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