Installing a magnetically mounted Citizen's Band radio antenna to a vehicle allows for convenient two-way communication, without the modifications necessary for a permanent installation. This type of antenna will not have the range of a full 1/4 wave, "steel whip" CB antenna, but it is far less obtrusive. Most magnetic-mount CB antennas will have a coil in the middle or bottom section of the antenna; this coil simulates the length of a steel whip, necessary for proper radio wave propagation in the CB band. The average radio enthusiast can install a magnetic mount antenna onto a car or truck within several minutes.
Check the vehicle's outside roof surface to ensure it is metal and uncovered by vinyl or fiberglass. The antenna's magnet may be able to cling to these surfaces, but it will not be able to ground properly, and it could reduce the radio's range.
Choose a location on the roof for the magnetic mount. The small magnet will stick to the vehicle in a variety of locations, but the very center of the roof is the best place.
Clean the area of the roof with soap and water. Rub the area that is going to secure the magnet with a dry cloth to remove dirt or wax that could cause the antenna to dislocate.
Measure the antenna's cable visually to ensure there is adequate length to reach from the CB radio to the roof. The longer the cable, the better, as the cable can wind around the passenger compartment and door openings.
Choose a direction for the antenna cable. The antenna will either have a built-in coaxial cable, or a connector for one. The direction should be toward the entry point for the cable, usually a rear door or trunk/hatch opening. When the door or hatch is closed, the wire could get pinched, so the entry point should have a gap or rubber seal, if possible.
Secure the magnet mount to the roof. Lift the antenna by the bottom coil or mast mount, and gently lower it onto the roof until the magnet attracts the metal. There may be a startling pop as the magnet sticks to the metallic roof.
Run the other end of the antenna cable through the entry point. Tuck the cable into the rubber gaskets of the door, and along body channels, until it is close to the radio. It can be laid beneath interior car mats for protection.
Connect the cable to the CB radio by pressing the male end of the cable into the female adapter on the rear of the unit. Most cables will have screw locks. Turn the tip of the cable clockwise until it tightens.
Turn the radio on and tune it to a channel with local traffic. Normally, channel 19 is popular near interstate highways.
Press the transmit button on the microphone and speak clearly, keeping an eye on the "TX meter," if available. This meter, usually four or five LED bars, will light up with the operator's voice as the signal is modulated and transmitted. Asking for a "signal check" is common CB parlance.
Release the transmit button and listen for a response. Ask the other party for a location (usually a highway mile marker) to verify range.
