Radio channels can be performed (portable) and automobiles (stationary). I believe there is little to describe. A mobile radio station is the one which is carried in your hand, on your belt, in your pocket, has small measurements and is powered with an integrated battery. It can be attached to a headset or tangent so you could communicate without even reaching the radio station itself. The most power of those radios is 5 inches, which allows you to communicate around 7-10 km from open terrain. Car (foundation ) radio - a much more compact and powerful device, which is powered either from the car's onboard system or by a power distribution device, even if it's used as a base (adjusted ) radio. When for mobile radios, antennas are...