Chicago city sound

Broadcasting

Many broadcast station transmitters are located at the top of Willis Tower. Each list is ranked by height from the top down. Stations at the same height on the same mast indicate the use of a diplexer into the same shared antenna. Due to its extreme height, FM stations (all class B) are very limited in power output.

Radio stations

East mast 482 m: WLIT FM 93.9 MHz main, 4.0 kW, AMFM WEBG FM 95.5 backup, 3.1 kW, AMFM 480 m: WBMX FM 104.3 main, 4.1 kW, CBS Radio 476 m: WTMX FM 101.9 main, 4.2 kW, Hubbard 474 m: WBBM FM 96.3 main, 4.2 kW, CBS Radio 472 m: WKSC FM 103.5 main, 4.3 kW, AMFM WGCI FM 107.5 main, 3.7 kW, AMFM 470 m: WFMT FM 98.7, 6.0 kW 468 m: WLS FM 94.7 main, 4.4 kW FCC query[72]

West mast 460 & 451 m: WFMT FM 98.7 backups 443 m: WBBM-FM 96.3 backup WBMX 104.3 backup unknown: W264BF 100.7 MHz, 2 W, Calvary Chapel of Costa Mesa table of allotments: **WLIT, WLS, WBBM, WTMX, WBMX, WCFS FCC query[73]

Also, NOAA Weather Radio station KWO39 transmits off the top of Willis Tower, at 162.550 MHz. KWO39, programmed by the National Weather Service Weather Forecast Office in Chicago, is equipped with Specific Area Message Encoding (SAME), which sets off a siren on specially-programmed weather radios to alert of an impending hazard, such as a tornado or civil emergency.
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