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Listen to Top Radio Stations in Saint Louis, MO for Free 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 plant transmitter. AM – in AM, the amplitude of the radio carrier wave is varied by the audio signal. AM broadcasting, the oldest broadcasting technology, is allowed in the AM broadcast bands, between 148–283 kHz in the low frequency band for longwave broadcasts and between 526–1706 kHz in the medium frequency band for medium-wave broadcasts. Because waves in these bands travel as ground waves following the terrain, AM radio stations can be received beyond the horizon at hundreds of miles distance, but AM has lower fidelity than FM. Radiated power of AM stations in the US is usually limited to a maximum of 10 kW, although a few (clear-channel stations) are allowed to transmit at 50 kW. Due to the small bandwidth, these systems cannot transmit voice, only text mes...