XHRF-FM (103.9 MHz) and XERF-AM (1570 kHz) 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 100,000 watts 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.