On July 11, 1953, WTMJ-TV moved to VHF channel 4, in order to alleviate interference with WKZO-TV (now WWMT) in Kalamazoo, Michigan, which is located nearly directly across Lake Michigan. The relocation of the station's channel allocation was a part of the FCC's complete revision of its Table of Channel Assignments, as issued in the "Sixth Report and General Order" issued by the agency on April 14, 1952. This move forced the CBS O&O on channel 4 in Chicago, WBBM-TV, to be reassigned to VHF channel 2; WBBM had moved to that frequency six days before WTMJ's channel relocation on July 5, 1953.