WBBM is the callsign of three broadcast stations in Chicago, Illinois: Call sign can refer to different types of call signs: Airline call sign Aviator call sign Cosmonaut call sign Radio and television call signs Tactical call sign, also known as a tactical designator See also: International Callsign Allocations, Maritime Mobile Service Identity This is a disambiguation page — a navigational aid... A broadcast station may be: a radio station a television station It does not include television networks or radio networks. ... Chicago (officially named the City of Chicago) is the third largest city in the United States (after New York City and Los Angeles), with an official population of 2,896,016, as of the 2000 census. ...
TV stationWBBM-TV - Channel 2, CBS television station
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WABC was quickly upgraded, and the signal relocated to a stronger frequency, 860 kHz.
(In 1946 WABC was re-named WCBS; the station moved to a new frequency, 880 kHz, in the FCC's 1941 re-assignment of stations.) As the network's flagship,WCBS was where much of CBS's programming originated; other owned-and-operated stations were KNX Los Angeles, KCBS San Francisco, WBBM Chicago, WJSV Washington, DC (later WTOP), KMOX St.
Louis, and WCCO Minneapolis.) Those stations remain the core affiliates of the CBS Radio Network today, with WCBS still the flagship, and all but WTOP (a Bonneville Broadcasting property) owned by CBS Radio.