WNBQ 1956 ads

[W.B.]

WNBQ, incidentally, was the only NBC-O&O'd VHF station not to go in line with the four other O&O's of the time in conforming their calls to the network's then-parent, in keeping with their byline "A Service of RCA" - unlike WRCA-TV New York; WRC-TV Washington, DC; KRCA Los Angeles; and, from 1956-65, WRCV-TV Philadelphia. When the Chicago station changed calls on Aug. 31, 1964, it was to WMAQ-TV.

As to why the radio station is now a "jock block" station: That was related to Viacom's takeover of CBS in the late 1990's, and their decision to end WMAQ Radio in 2000 and move the sports station to the 670 frequency.