XHRF-FM () and XERF-AM () are radio stations in Ciudad Acuña, Coahuila, Mexico. Originally only on the AM band, XERF is a Mexican Class A clear-channel station transmitting with of power. Now branded as La Poderosa, XHRF-FM and XERF-AM simulcast their programming and are owned by the Instituto Mexicano de la Radio (IMER), a Mexican public broadcaster. In earlier times, XERF was operated under the laws of Mexico by Ramón D. Bósquez and Arturo González, transmitting as a border blaster, featuring famed disc jockey Wolfman Jack. XERF received its concession on , and commenced operations, using the old facilities of John R. Brinkley's XERA, which ceased broadcasting in . XERF was not a continuation of XERA. Cross-national operation (19491986) The facilities of the old XERA border blaster, which had been created by John R. Brinkley, were confiscated by the Mexican government in , and Villa Acuña did not have another high-power station until , when the Compañía Radiodifusora de Coahuila, S.A., headed by Ramón D. Bósquez and Arturo González, signed XERF-AM on the air on . The station used XERA's old transmission site, with a power of (later increased to ); its first day of broadcasting included a formal opening featuring programs from the chambers of commerce of both Villa Acuña and Del Rio, Texas and the presence of the Bishop of Saltillo. For many years, the station made money by selling its time after nightfall to American evangelists who broadcast in English to the United States. The border blaster Prior to , XERF retained the Wilson and Howard Radio Advertising Agency to handle its United States ad sales. In that year, Bósquez and González formed a Texas corporation called Inter-American Radio Advertising, Inc. which was located on Pecan Street in Del Rio, Texas. While XERF's concession remained with Compañía Radiodifusora de Coahuila, the actual control of the airtime and the management of the facilities in Ciudad Acuña were under the control of Inter-American Radio Advertising. The Texas company purchased a RCA transmitter to broadcast an omni-directional clear channel signal on AM 1570, which originated some distance from the old XERA facilities within three new prefabricated concrete buildings with flat roofs. The sales brochure for XERF offered this explanation about the operation of the station (emphasis and wording shown as in the original text): There is, of course, one BIG difference between U.S. and Mexican Stations, and that is a