KSTN (1420 kHz is a commercial AM radio station in Stockton, California, owned by Robert LaRue, and licensed by KSTN, LLC. It airs a country music radio format, known as "105.9 The Bull." KSTN broadcasts at 5,000 watts by day. But to reduce interference at night to other stations on AM 1420, it reduces power to 3,500 watts. KSTN uses a directional antenna at all times. The transmitter is off Ralph Avenue in Stockton, along with the studios and offices. Programming is also heard on 250 watt FM translator K290AG at 105.9 MHz.