Antennas & mounts
An antenna must fit the radio, the service, the frequency, and the installation. A connector that screws on only proves mechanical fit; it does not prove good performance or legal use.
Start with the service and band
One antenna recommendation cannot cover 27 MHz CB, 151/154 MHz MURS, and 462/467 MHz GMRS.
| Service | Band | Antenna rule or practical check |
|---|---|---|
| GMRS | UHF · 462/467 MHz | External or removable antennas on models designed for them; check the equipment instructions and applicable ERP limits. |
| FRS | UHF · 462/467 MHz | Integral, non-removable antenna. Do not add an external antenna connection. |
| CB (CBRS) | HF · 27 MHz | Use a CB-band antenna and a compatible mount. An outdoor installation must meet CB antenna-height rules. |
| MURS | VHF · 151/154 MHz | External antennas are an option on suitable equipment; MURS antenna-height rules still apply. |
FRS integral-antenna rule: §95.587 · CB height: §95.941 · MURS height: §95.2741.
Gain changes the pattern
Gain is a comparison of radiation in a direction, not power created by the antenna.
dBi uses an isotropic reference; dBd uses a half-wave dipole. For the same direction and
conditions, 0 dBd is approximately 2.15 dBi, so check which one a listing uses before comparing numbers.
More vertical gain means a flatter, narrower elevation pattern. That can help on flat ground and hurt in hills, near buildings, or when the other station is higher up. Quarter-wave and 5/8-wave labels do not establish the finished pattern by themselves: the vehicle body, radials, mast, nearby objects, losses, and installation geometry all matter.
Mounts solve different problems
Choose for the antenna design, structure, cable route, weather exposure, and permanence.
| Mount | Typical role | Check before buying |
|---|---|---|
| Handheld connection | Replaceable whip where the service and model permit it | Exact connector halves, band coverage, physical clearance, strain, and equipment instructions |
| Magnetic vehicle mount | Temporary external antenna on suitable metal | Required ground plane, cable entry, paint protection, retention, height, and weather sealing |
| NMO vehicle mount | Permanent or bracket-mounted mobile antenna | Hole or bracket requirements, metal contact/bonding, underside clearance, gasket installation, and cable termination |
| Mirror / lip / stake mount | Vehicle mounting without a roof-center hole | Whether the antenna needs a ground plane, bonding path, pattern effects, mechanical load, and clearance |
| Mast or structure mount | Outdoor home antenna | Service height limits, support loads, setbacks, feed-line route, bonding, grounding, lightning protection, and local requirements |
Feed-line loss needs a calculation
Frequency, cable type, length, connectors, and installation quality determine the result.
Use the cable manufacturer's attenuation figure at or near the operating frequency, scale it to the actual run length, and add connector or adapter losses where known. At the same length, a UHF GMRS run normally loses more in a given cable than a VHF MURS or HF CB run.
- High SWR on a lossy line adds more loss than the matched figure suggests.
- Short flexible cable can be reasonable in a vehicle even when it would be too lossy for a long mast run.
- Larger low-loss cable helps long runs but needs compatible connectors, bend radius, support, and strain relief.
- Use outdoor-rated cable, seal exterior connections with a method approved for the hardware, and plan bonding and lightning protection at the entry point.
The Nagoya comparison covers specific handheld and mobile antennas for GMRS use; it is not a general CB or MURS list.
The station page lists the antennas in use on this site’s own GMRS station. Band coverage on an antenna does not authorize a radio to transmit in another service.