WTDY-FM (96.5 MHz) is a commercial radio station in Philadelphia, Pennsylvania. The station is owned by Audacy, Inc. and broadcasts a Top 40/CHR format. WTDY's studios are co-located with located within Audacy's corporate headquarters in Center City, Philadelphia, while its transmitter is located off Domino Lane in the Roxborough section of Philadelphia, a site where other local FM and TV towers are located. History 1945-1958: Early years Independence Broadcasting Company, the owners of WHAT (1340 AM), applied to the Federal Communications Commission for a construction permit for a new FM station on 103.5 MHz on October 5, 1945. The FCC granted the permit on July 10, 1947, while reassigning the station to 105.3 MHz. The FCC granted permission on December 2, 1948 for the station to begin broadcasting, by which time it had been assigned the WHAT-FM call sign. In 1956, a young disc jockey known as Sid Mark took the airwaves for the first time in Philadelphia on WHAT-AM-FM, beginning a multi-decade career. On July 24, 1957, Independence Broadcasting applied to the FCC for a construction permit to change the station's frequency to 96.5 MHz. The FCC granted the permit on October 30, 1957, followed by a new license effective September 26, 1958. 1958-1975: Jazz WHAT-FM became a full-time Jazz station in 1958, the first of its kind on the FM dial. On November 18, 1968, the call sign was changed to WWDB, referring to the brother and sister owners of the station, William and Dolly Banks. In the early 1970s, WWDB experimented with playing adult contemporary music, but eventually went back to jazz. 1975-2000: Talk In 1975, the station's format was changed to all talk, making WWDB the first full-time talk station in the United States that was exclusively on the FM dial. On-air talk personalities included Irv Homer, Bernie McCain, Frank Ford, Phil Valentine, Tom Marr, and Bernie Herman. The station called itself "WWDB, The Talk Station." The station carried no syndicated shows, as is common today. Around the clock, all talk programming and news updates came from the WWDB staff. Meanwhile, WHAT continued as one of Philadelphia's leading stations aimed at the African-American community. After her brother William died in 1979, Dolly Banks took over as general manager. William Banks had no children, so several distant relatives filed lawsuits, fighting for ownership of WWDB and WHAT. In 1985, Dolly Banks retired after the African-American employees of