GMRS setup guides GMRS range
GMRS range How far an HT, mobile, base station or repeater reaches
The FCC says to expect one to twenty-five miles, depending on the type of station, the terrain and whether you use a repeater. Two HTs at head height run into the curve of the earth after about 6 miles, even on flat ground. Range comes mostly from antenna height. A repeater on a tower is the usual way to reach 20+ miles; extra watts help less than most people expect.
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How this page works: the range figures are the FCC's own words, maker claims quoted as claims, and radio-horizon arithmetic from a standard formula. The arithmetic is not a measurement. Terrain, foliage and buildings usually reduce real range below these estimates.
What the FCC says
The FCC’s GMRS page: “A GMRS user can expect a communications range of one to twenty-five miles depending on station class, terrain, and repeater use” (FCC, checked 2026-10-21). “Station class” means the type of station: a handheld (HT), a mobile in a vehicle, a base station at home, or a repeater. For comparison, the FCC says FRS radios on channels 8–14 usually reach “less than one-half mile” (FCC FRS page).
Antenna height and the radio horizon
GMRS is UHF (462–467 MHz). At these frequencies signals travel roughly in a line of sight, so the curve of the earth sets a hard limit. The standard estimate of the radio horizon, using the usual 4/3-earth-radius allowance for atmospheric bending, is:
Radio horizon (miles) ≈ 1.41 × √(antenna height in feet). Add the horizons of the two antennas to get the farthest two stations can be apart over smooth earth (line-of-sight propagation, radio horizon).
Worked out for common GMRS setups. This is arithmetic over flat, clear ground, not a measured or guaranteed range:
| Setup (antenna heights) | Each horizon | Smooth-earth limit |
|---|---|---|
| HT to HT, both held at about 5 ft | 3.2 mi + 3.2 mi | about 6.3 mi |
| Mobile to mobile, roof antennas at about 6 ft | 3.5 mi + 3.5 mi | about 6.9 mi |
| Base station antenna at 30 ft to an HT at 5 ft | 7.7 mi + 3.2 mi | about 10.9 mi |
| Base station at 30 ft to another base at 30 ft | 7.7 mi + 7.7 mi | about 15.4 mi |
| Repeater antenna at 200 ft to an HT at 5 ft | 19.9 mi + 3.2 mi | about 23.1 mi |
| Repeater antenna at 500 ft to an HT at 5 ft | 31.5 mi + 3.2 mi | about 34.7 mi |
Two things follow. First, raising one antenna from 5 ft to 30 ft adds more distance than any power upgrade. Second, a repeater on a tower or hilltop is how GMRS reaches the top of the FCC’s range. Hills, trees, buildings and the inside of a vehicle all cut into these figures. A station on a mountaintop can also beat them, because its effective height is much greater.
What more watts buy
- The limits: most handhelds in our database file 4.1–5.5 W ERP on the 462 MHz main channels; the TD-H3 GMRS files 1.4 W and the Baofeng GM-15 Pro 1.1 W. Mobiles may run up to 50 W transmitter output on the main channels (§95.1767). The MXT575 files 48.87 W conducted.
- In decibels: 50 W is 10 dB more than 5 W. Under the inverse-square law, 10 dB is worth about 3.2× the distance in free space, not 10×. Over the horizon or through terrain, extra power buys much less.
- The 462 MHz interstitial channels (FRS 1–7) are capped at 5 W ERP for everyone, and 467 MHz interstitials (FRS 8–14) at 0.5 W ERP for HTs. A 50 W mobile doesn’t get more range on those channels (channel chart).
- Filed power among HTs barely differs. Most GMRS handhelds we track are within about 1.3 dB of each other on the 462 MHz main channels (4.1–5.47 W ERP, radio table), a difference you’re unlikely to notice. The TD-H3 GMRS (1.4 W) and Baofeng GM-15 Pro (1.1 W) are about 5–6 dB below the rest. Brand doesn’t change the horizon.
What makers claim
| Radio | Maker’s range claim | Source |
|---|---|---|
| BTECH GMRS-V2 | “1–5+ miles” simplex; “15–50+ miles” through repeaters | BTECH product page |
| Rocky Talkie Expedition | “Max range of over 35 miles”; “2–8 miles more typical in backcountry terrain” | Rocky Talkie product page |
| Midland GXT67 PRO | “Up to 5 miles, depending on the terrain” | Midland GXT67 FAQs (midlandusa.com) |
The FCC doesn’t certify range, and the grants don’t list it. Treat any “35-mile” or “50-mile” figure as a best case from a mountaintop or through a repeater.
Ways to get more range
- Use a repeater. Ask the owner for access and the tones (directories such as myGMRS list many). A repeater’s height does the work. See repeaters and mobile setup.
- Raise the antenna. At home, a base station antenna on the roof or a mast. In a vehicle, an antenna mounted outside on the roof instead of an HT inside the cab. Check the height limits in §95.317 and your grant’s RF-exposure distance (antenna guide).
- Use a better antenna on the radio you have. That only works if the antenna comes off. Among our HTs, the documented removable ones are the Rocky Talkie Expedition (SMA, 7.5 cm and 17 cm included) and the BTECH GMRS-V2 (SMA). HTs that send texts or GPS data must have a fixed antenna by rule (§95.1787(a)(4)).
- Then consider power: a 15–50 W mobile with an outside antenna, which combines height, a better antenna and more power.
- Pick a clear channel and use the 462 MHz main channels (FRS 15–22) for the highest allowed power, if no local repeater uses that channel’s output.
HTs with a documented removable antenna
These two are the removable-antenna HTs we cover in depth. The Radioddity GM-30 (SMA-M) and Baofeng UV-5G Plus (SMA-Female) also document removable antennas.
Rocky Talkie Expedition Radio (5 W): SMA-male antenna, 7.5 cm and 17 cm versions included, IP67. Spec page
Where to buy · Rocky Talkie Expedition Radio (5 Watt): $195 maker list price (checked 2026-10-21). No retailer link yet.
BTECH GMRS-V2: removable antenna (BTECH: “SMA-Female antenna”), CHIRP programming, IP54. Spec page
Where to buy · BTECH GMRS-V2
$44.89 maker list price at BTECH
We earn a commission if you buy through this link, at no extra cost to you. How we make money
Before you order an antenna, check the connector gender on the radio itself (SMA explained).
What we haven’t verified
- Real-world range for any radio, antenna or repeater.
- Any maker’s range claim. They’re quoted as-is.
Related: GMRS vs FRS, MURS, CB and ham · how to choose a GMRS radio · best GMRS radios for hiking · best GMRS mobile radios · GMRS base station setup · vehicle antennas · handheld antenna upgrades
Common questions
How far can two GMRS handhelds talk?
The FCC gives no handheld-only figure. Its range for GMRS overall is “one to twenty-five miles depending on station class, terrain, and repeater use.” With both HTs held about 5 ft up on flat, open ground, the standard radio-horizon estimate is about 6.3 miles. Trees, hills and buildings usually cut that well short. Maker claims for the HTs we track range from “1–5+ miles” (BTECH GMRS-V2, simplex) to “2–8 miles” in backcountry terrain (Rocky Talkie Expedition).
Will a 50 W mobile radio get me 10 times the range of a 5 W HT?
No. 50 W is about 10 dB more than 5 W. In free space that would roughly triple distance, not multiply it by ten. On the ground, the radio horizon and terrain usually set the limit first. A roof antenna on the vehicle and the higher power both help, but height still dominates.
Why can I hear a repeater but it can't hear me?
Usually the repeater has a high antenna and more power than your radio, so its signal reaches you farther than yours reaches it. The other common cause is setup: the wrong input tone or a missing +5 MHz offset. See privacy codes and repeater tones and repeaters and mobile setup.