KNST is a news/talk radio station in Tucson, Arizona, broadcasting at 790 kHz. The station serves the greater Tucson area, including the nearby enclaves of Marana, Oro Valley, Green Valley, Sahuarita, Sierra Vista, and Vail. Its studios are located north of downtown Tucson along Oracle Road, while the transmitter site is in West Tucson.KNST is the tenth most listened to commercial radio station in Tucson. (including noncommercial radio stations, KNST rates 13th).