In other words, if you can't SEE it, you can't talk to it. If there is any disadvantage to GMRS its that its only "line-of-sight" transmission. If you want to know more about repeaters, let me know. When your radio is in repeater mode it LISTENS to frequency B, but when you push the button it automatically switches to frequency A, then switches back to B when you let go of the button. The receiver picks up your transmission on frequency A and sends it to the transmitter that sends it out frequency B at that exact same time, as if you were actually standing on top of that mountain. Just as standing on top of a mountain lets you see farther, a mountain top repeater also allows your radio signal to travel farther. GMRS also gives you the ability to use "repeaters" which simply stated are nothing more than a receiver and a transmitter tied together on a mountain top to increase your broadcast range. You can mount a GMRS antenna almost anywhere and barely know its there! While a 1/4 wave antenna for CB is 9' (remember those long stainless steel whips?), a 1/4 wave antenna for GMRS is 6". The higher the frequency, the shorter the antenna. The other advantage to GMRS radio is the higher frequencies. What sounds better, your FM stations in the car or the AM? Clearly FM is the winner! GMRS is a LICENSED service and therefore you need to buy a license, but it does NOT require a test like ham radio does. However GMRS uses UHF frequencies (467MHz) rather than HF (27MHz) and FM (frequency modulation) rather than AM (amplitude modulation). GMRS is basically a throw back to the the days of licensed CB radio which was intended for the general pubic. GMRS (General Mobile Radio Service) Radio is becoming very popular with off-road enthusiasts thanks to a few "influencers" and Midland.
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