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MOST UHF radio's do NOT permit transmitting on the FRS / GMRS frequencies by default. This is because the UHF radio transmits at 5W which is too powerful for the FCC and CRTC regulated transmit frequencies of 0.5W FRS and 2.0W GMRS. Therefore, out of the box, most UHF sets will only RECEIVE on the FRS and GMRS bands.
That being said, it's usually an easy mod to the radio (unsolder one diode) to permit TX and RX on those frequencies. Beware however that SOME radios will still drop the TX power to within CRTC limits.
A decent UHF set will run you anywhere from $200 - $400.
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