XESURF-AM (540) is a Mexican radio station licensed to Tijuana, Baja California, Mexico, serving the San Diego–Tijuana metropolitan area. XESURF airs a Spanish language religious radio format, operated by Zion Multimedia Inc. located in Downey, California. XESURF's transmitter site is located near Tijuana. With 25,000 watts, its signal is heard throughout much of Southern California, including the San Diego and Los Angeles metropolitan areas, as well as northern Baja California.