KSLR (630 kHz) is a commercial AM radio station in San Antonio, Texas. It is owned by the Salem Media Group and airs a Christian talk and teaching radio format. The studios and offices are on McAllister Freeway in San Antonio. KSLR transmits with 5,000 watts by day, but at night when radio waves travel farther, it reduces power to 4,300 watts. It uses a directional antenna at all times. The transmitter and four-tower array are off Rigsby Avenue (U.S. Route 87) in China Grove.