CHP units are spec'd to go anywhere in the state.. From Death Valley (middle of nowhere with non existent radio coverage) to the tallest mountain ranges in the lower US (Mt. Whitney) to Pacific Coast Highway from Pt Mugu to Santa Monica (notoriously horrible radio reception) vast deserts, lots of hilly, empty, terrain.. metro areas, rural areas, forests, canyons, mountains and everything in between. So the coms need to be quite versatile. A CHP car can go anywhere in the state, and still hear and be heard 10-2, which, on some occasions, requires unleashing a really really long antenna.