History: April 2016 Archives

Broadcast History: Behind the Clear-Channel Matter

Early chaos in frequency assignment, the first 40 clear-channel stations, proposals for "super-power AM radio," and the watering down of clear-channel exclusivity.

Evolution of the American AM Band: A Brief History by Ed Ripley: Includes a discussion of WLW's brief period running as a 500,000 super-power AM station and the use of directional transmitters.

Wikipedia: Clear-channel station: History of the concept and a list of current clear-channel stations.

1941 North American Radio Broadcasting Agreement: Resulted in a massive shift in frequencies to make way for clear-channel stations in neighboring countries; moved KVOO from 1140 to 1170.