Range
As for other UHF radio services, reliable range is considered to be line-of-sight and the distance to the radio horizon can be estimated based on antenna height. Theoretical range between two hand-held units would be about one or two miles (about one and a half to three km), mobile units have higher antennas and range of around 5 miles (8 km). A GMRS repeater with an antenna that is high above the surrounding terrain can extend the usable range over a wide area, for example up to 20 miles radius around the repeater station. Obstructions such as hills and buildings can reduce range. Higher power does not necessarily give a proportional increase in range, although it may improve the reliability of communication at the limits of line-of-sight distance.
Read more about this topic: General Mobile Radio Service
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