in Chicago, above ground and had an effective radiated power of 29,000 watts. The station was sold to Louis Lee and call letters were changed to WSBC-FM. WSBC-FM The station began broadcasting March 15, 1960, holding the call sign WSBC-FM. The station's studios and transmitter were located at the West Town State Bank Building at 2400 W. Madison in Chicago, and it had an ERP of 27,500 watts. WSBC-FM featured a variety of musical programming, including classical, jazz, folk, and popular music shows, and simulcast some of the ethnic programming of its sister station 1240 WSBC, when the shared time station was on the air. The station was owned by Louie Lee. In 1962, its ERP was increased to 55,000 watts. WXRT In 1963, the station's call sign was changed to WXRT. The station increasingly aired ethnic programming. In 1971, WXRT's studios and transmitter were moved to 4949 West Belmont Ave., where it operated with an ERP of 50,000 watts at a HAAT of 500 feet. In 1981, the station's transmitter was moved to the John Hancock Center. The format as it exists today began in August 1972 as a nighttime-only freeform rock experiment, while a variety of ethnic programming continued to air during the daytime hours. The part-time progressive rock format was started by Don Bridges, who soon brought in Mitch Michaels and a bit later John Platt, Seth Mason, and Bob Schulman. Norm Winer served as program director from 1979 through 2016. Greg Solk was named program director in 2017. Laura Duncan joined as Program Director in 2021. The format's hours were gradually expanded, and on April 26, 1976, it began airing 24 hours a day. The station was branded "Chicago's Fine Rock Station" and later "Chicago's Finest Rock". In the 1980s, the station heavily played music from the new wave, synthpop, and alternative rock groups of that era. By the 1990s, the station's format was considered adult album alternative. The station's offices and studios were located at 4949 West Belmont Ave. on the northwest side of Chicago until 2008, when it was relocated to the NBC Tower in downtown Chicago. On March 16, 2010, it was again relocated to the Prudential Plaza. In 1995, Danny Lee, son of the station's original owner Louie Lee, sold the station to Westinghouse for $44 million. Shortly thereafter, Westinghouse would acquire CBS and Infinity Radio, with the company changing its name