Wikipedia
WDZ
WDZ (1050 kHz) is a commercial AM radio station licensed to Decatur, Illinois. It broadcasts a sports radio format. WDZ is owned by the Neuhoff Corporation, which also owns four other local radio stations, WCZQ, WDZQ, WSOY and WSOY-FM. Studios and offices are located on North Water Street and the transmitter is near St. Louis Bridge Road.
WDZ calls itself the oldest radio station in Illinois, starting as an experimental agricultural station in 1917 (although WBBM in Chicago traces its history to 1911). It operates at 1000 watts by day but must reduce power to 250 watts at night so it doesn't interfere with other radio stations on 1050 kHz, which is a clear channel frequency assigned to Mexico.