On March 29, 1924, the Chicago Tribune's radio operations over what had been WJAZ began from the Edgewater Beach Hotel. Reprinted below is the text of a radio advertisement listing the schedule of programming for opening night:

STATION W-G-N
CHICAGO TRIBUNE, Zenith Station, Begins Broadcasting at 6 o'clock tonight from the Edgewater Beach Hotel. Wave Length 370 meters.

INAUGURAL PROGRAM 6 p.m. Saturday to 8 a.m. Sunday

The Chicago Tribune intends to maintain in its broadcasting standards of entertainment and instruction worthy of the call letters WGN. Watch The Tribune every day for detailed programs.