KSDK (channel 5) is a television station in St. Louis, Missouri, United States, affiliated with NBC and owned by Tegna Inc. The station's studios are located on Market Street in Downtown St. Louis, and its transmitter is located in Shrewsbury, Missouri. History The station first signed on the air as KSD-TV on February 8, 1947. It was owned by the Pulitzer Publishing Company, publishers of the St. Louis Post-Dispatch and owners of KSD radio (550 AM, now KTRS). It was the ninth television station to sign on in the United States and the first television station in Missouri. The station's original studios were located adjacent to the Post-Dispatch building on Olive Street. It was the second commercial station located west of the Mississippi River, following KTLA in Los Angeles, which had signed on just 17 days earlier. In the early days, KSD produced much of its own programming and developed its own talent pool. Many St. Louis television pioneers from KSD-TV came from radio, including Frank Eschen, Kay Morton, Russ Severin and Dave Russell. Because of a freeze on new television station licenses imposed by the Federal Communications Commission (FCC), KSD-TV was the only television station in the St. Louis market, until WTVI (channel 54, now KTVI channel 2, a Fox affiliate) signed on in August 1953. Often known as simply "Channel 5," the station has always been an NBC affiliate, owing to KSD radio's longtime affiliation with the NBC Red Network. The station is currently the longest-tenured affiliate of any major broadcast television network. In its early years, Channel 5 also carried secondary affiliations with CBS, DuMont and ABC. In the early 1960s, Channel 5 became the first St. Louis television station to broadcast in color. After Pulitzer sold KSD radio to Combined Communications Corporation in 1979 (prior to Combined's merger into the Gannett Company that same year), KSD-TV, in order to comply with an FCC regulation in place then that stated that TV and radio stations in the same market, but different ownership had to use different call signs, modified theirs to the current KSDK on July 10, 1979. In 1982, the station relocated its studios from its original location on Olive Street to their present location on Market Street in Downtown St. Louis. In 1983, Pulitzer traded channel 5 to Multimedia, Inc. in return for WFBC (now WYFF) in Greenville, South Carolina, and WXII-TV in Winston-Salem, North