A clear-channel station is an AM band radio station in North America that has the highest protection from interference from other stations, particularly concerning night-time skywave propagation. Usually known as class A stations since 1982, they are occasionally still referred to by their former classifications of class I-A, class I-B, or class I-N. The term "clear channel" is used most often in the context of North America and the Caribbean, where the concept originated.
Since 1941, these stations have been required to maintain at least 10,000 watts of power to retain their status.
Read more about Clear-channel Station: Description, History, List of All Clear-channel Stations
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