![]() 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. ![]() AM band: When radio broadcasting first became popular in the 1920s it was primarily within what is now the AM broadcast band, which spans from 540 to 1700 kHz.Under its oversight a variety of broadcasting services have been developed, including: Radio communication in the United States is regulated by the Federal Communications Commission (FCC). Overview United States Broadcasting Station Totals However, the term has evolved to more broadly refer to streaming audio services in general, including subscription satellite, and cable and Internet radio. Originally the term "radio" only included transmissions freely received over-the-air, such as the AM and FM bands, now commonly called "terrestrial radio". However, the rise of television broadcasting in the 1950s relegated radio to a secondary status, as much of its programming and audience shifted to the new "sight joined with sound" service. During the Golden Age of Radio it had a major cultural and financial impact on the country. It was the first electronic " mass medium" technology, and its introduction, along with the subsequent development of sound films, ended the print monopoly of mass media. households owned at least one radio receiver, while a majority did by 1931 and 75 percent did by 1937. Radio broadcasting has been used in the United States since the early 1920s to distribute news and entertainment to a national audience.
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