KZNS (1280 kHz, The KSL Sports Zone) is a commercial AM radio station in Salt Lake City, Utah. It airs a sports radio format and is owned by Jazz Communications LLC. Programming is simulcast on co-owned KZNS-FM 97.5, licensed to Coalville, Utah. On weekdays, KZNS-AM-FM have local hosts discussing Salt Lake City and national sports. Nights and weekends, programming is supplied by Fox Sports Radio. KZNS-AM-FM are the flagship radio stations for the Utah Jazz basketball team and the Salt Lake Bees Minor League Baseball team. KZNS's transmitter is near the Jordan River in North Salt Lake, and their headquarters are located inside the Vivint Arena in Salt Lake City. It is a Class B radio station, running 50,000 watts by day, the maximum power for commercial AM radio stations in the U.S. But at night, to protect other stations on 1280 AM, it drops power to just 670 watts. It uses a directional antenna at all times. History KNAK The station first signed on the air in February, 1945, and held the call sign KNAK. The station was owned by the Granite District Radio Broadcasting Company with studios in the Continental Bank Building on South Temple at Main Street. KNAK first broadcast on 1400 kHz at only 250 watts. By this time, KSL was powered at 50,000 watts. KNAK was not associated with any of the big radio networks. Salt Lake City had four other radio stations, network affiliates of CBS, NBC, ABC and the Mutual Broadcasting System. In the 1950s, KNAK moved to 1280 kHz, accompanied by an increase in power to 5,000 watts by day, 500 watts at night. KWMS On January 16, 1976, the station's call sign was changed to KWMS. As KWMS, the station aired an all-news format. It was an affiliate of NBC Radio's "News and Information Service" (NIS), a 24 hour all-news network. NIS was discontinued in 1977. KWMS began doing a local version of the all-news format using its own anchors and the services of the Mutual Broadcasting System. KDYL On July 21, 1982, the station's call letters switched to KDYL. In the early and mid 1980s, KDYL aired an all-news format. By 1986, the station had begun airing the "Music of Your Life" adult standards format, featuring big band music and adult pop songs from the 1940s, 50s and 60s. The station continued airing this format until June 27, 2000. On