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St Louis MO Radio Stations Listen Online Electronic countermeasures – Military defensive electronic systems designed to degrade enemy radar effectiveness, or deceive it with false information, to prevent enemies from locating local forces. It often consists of powerful microwave transmitters that can mimic enemy radar signals to create false target indications on the enemy radar screens. Radio broadcasting means transmission of audio to radio receivers belonging to a public audience. FM broadcasting was introduced in the late 1930s with improved fidelity. Most radios can receive both AM and FM and are called AM/FM receivers. Two radio transmitters in the same area that attempt to transmit on the same frequency will interfere with each other, causing garbled reception, so neither transmission may be received clearly. These use even larger antennas called ground dipoles, consisting of two ground connections 23–60 km (14–37 mi) apart, linked by overhead transmission lines to a power