KMIZ went on the air for the first time on December 5, 1971 as ABC affiliate KCBJ-TV. Before then, ABC had been relegated in the Central Missouri market to secondary clearances on NBC affiliate KOMU-TV and CBS affiliate KRCG. KCBJ was originally owned by brothers Richard & Robert Koening, under the name Channel 17 Inc. The station's original studios were located on South 7th Street in Columbia.