6/4/2023 0 Comments Us radio network![]() ![]() Shortwave: Shortwave broadcasting in the United States also dates back to the 1920s, though the shortwave bands were nationalized during World War II and was not opened to private broadcasters again until 1962.Because of this, the FCC allows some AM stations to simulcast their programming, and in some cases extend their hours of operation, over translator stations operating on the FM band. Beginning in the 1970s, AM listenership has significantly declined, primarily shifting to the FM band. Before television, AM radio was the predominant broadcast entertainment medium in America. ![]() Less powerful stations share frequencies and may either shut down, drastically reduce power and/or dramatically change its directional pattern to avoid interference at and near sunset, flipping back at sunrise. The AM band continues to be used, with the most powerful clear-channel stations granted a coverage area of hundreds of miles from its transmitter at night, when atmospheric conditions carry AM signals far longer by reflecting signals that would otherwise head into space back to Earth.
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