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One of the nation's first radio stations began broadcasting in Detroit on August 20, 1920 -- station 8MK, now operating as WWJ. The station was owned by the Detroit News, and its daily program was called "Tonight's Dinner." For some reason, the station was granted an amateur license, which soon changed to commercial. The first station granted a commercial license was KDKA in Pittsburgh, which began broadcasting in October of 1920. Radio soon caught the public's fancy, and the number of stations grew rapidly. Now, there are more than 11,000 radio stations across the U.S.

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