WJMK, a radio station (104.3 FM) licensed to Chicago, Illinois, United States, which held the callsign WJJD-FM from 1961 until the 1970s
CBS Radio occupies the 9th, 10th, 11th, and 12th floors, including WBBM, WBBM-FM, WJMK-FM, WXRT, WUSN, WSCR and WCFS
see also