XEPRS (1090 kHz) is an AM commercial radio station licensed to Playas de Rosarito, a suburb of Tijuana in Baja California, Mexico. It broadcasts a Spanish Christian radio format. The station can be heard across the San Diego-Tijuana, Los Angeles-Orange County, Riverside-San Bernardino and areas of Southern California.

XEPRS is a Class A, 50,000-watt clear-channel station using a non-directional antenna in the daytime. Because it must protect other Class A stations on 1090 AM, it uses a three-tower array directional antenna at night. The transmitter is just off Mexican Federal Highway 1D in Fraccionamiento Rancho del Mar. The daytime signal can be heard over much of coastal Southern California and parts of Baja California. At night, the skywave signal extends over much of the West Coast of the United States and Northwestern Mexico.

Today's 1090 AM started out as 150,000-watt XERB on 730 kHz. The original concession was awarded to Manuel P. Barbachano, grandson of one-time Governor of Yucatán, Miguel Barbachano. The concession was sold to Radiodifusora Internacional, S.A., in 1939. As part of the North American Regional Broadcasting Agreement in 1941, the station moved from 730 to 1090, with a power of 50,000 watts. XERB was sold to Interamericana de Radio, S.A., in 1950.

In the early 1960s, Robert Weston Smith (better known as Wolfman Jack) was living in Del Rio, Texas and appearing on the 250,000-watt "border blaster" radio station XERF (1570 AM), just over the Rio Grande in Ciudad Acuña. In 1964, after several violent incidents at XERF's transmitter, Smith and partner Marvin Kosofsky (called "Mo Burton" in Wolfman Jack's autobiography) decided to relocate to an American radio station. They purchased Minneapolis-area daytimer station KUXL 1570. Smith moved to Minnesota and never appeared as Wolfman Jack on KUXL, but rather worked as the station's general manager while shipping Wolfman shows on tape to XERF.

In 1965, Smith made an arrangement with the U.S. agent to program another border blaster, XERB in Tijuana. Smith began selling ad time on the "Mighty 1090" and recording Wolfman Jack shows for his new affiliate. Initially, Smith controlled the station's affairs from Minneapolis, but in 1966, Smith, along with fellow KUXL staffers Ralph Hull (also known as Preacher Paul Anthony and The Nazz) and Art Hoehn (also known as Fat Daddy Washington), relocated to Southern California to run XERB full-time.

Wolfman and his associates were able to make the station turn a large profit by selling 15–30-minute blocks of time to radio proselytizers. The preachers were able to pay for the time by asking their listeners to send them donations. Because they had such a large following and made so much money, the radio evangelists were willing to pay sizable fees for airtime.

In addition to the paid brokered programming, Wolfman began broadcasting his own pre-recorded shows on three different high-powered Mexican stations at different times of the day: XERB, XERF, and XEG in Monterrey, Nuevo León, powered at 100,000 watts. Wolfman courted advertisers who enjoyed his brand of rock and roll music and his howling personality.

According to his biography, by 1971, Wolfman was making a profit of almost $50,000 a month. The Mexican company executives that leased XERB noticed this and got greedy. They wanted to throw him out and make all the money themselves. The owners bribed Mexican officials into politically squeezing Wolfman off the air. The Mexican government acquiesced by passing a law prohibiting Pentecostal and Evangelical religious programming on Mexican airwaves. Since XERB made most of its profits from airtime sold to the prayer-cloth preachers, Wolfman could no longer make payments to the owners each month. "That was it," Wolfman remembered. "In one stroke they cleaned out 80 percent of all the money we were expecting to make." He and Kosofsky had to return control of the station to the Mexican owners.