Stations are often affiliated with a radio network that provides content in a common radio format, either in broadcast syndication or simulcast, or both. To receive the content the listener must have a broadcast radio receiver ( radio). In terrestrial radio broadcasting the radio waves are broadcast by a land-based radio station, while in satellite radio the radio waves are broadcast by a satellite in Earth orbit. Radio broadcasting is the broadcasting of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. For a broader concept, see Radio communication station.
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