WGN AM 720 Chicago

On March 28, 1924, radio station WGN Chicago, Illinois, went on-the-air. It & another Chicago radio pioneer broadcaster, WLS, still carry the same 3 call letters today. On May 12, 1923, Zenith Radio Company began broadcasting with the callsign WJAZ from the Edgewater Beach Hotel. However, after this brief period, the Tribune switched its operations to WDAP, and the Zenith station became WEBH, eventually being deleted from the license rolls on November 30, 1928. Early programming was noted for its creativity and innovation.

Wikipedia

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