KIDR (740 kHz) is an AM radio station in Phoenix, Arizona. KIDR is owned by En Familia, Inc. and airs a Spanish-language Roman Catholic religious radio format. The station's transmitter is off South 23rd Avenue in Phoenix. The station broadcasts with 1,000 watts by day; but because AM 740 is a Canadian clear-channel frequency, it must reduce power to 292 watts at night to avoid causing interference to CFZM. The station also protects KCBS in San Francisco and KTRH in Houston. KIDR uses a directional antenna around the clock.