KRDU (1130 AM) is a radio station broadcasting a Christian Talk/Teaching format. Licensed to Dinuba, California, USA, it serves the Fresno-Visalia area; regarded as America's 1st commercial Christian radio station. On the air since 1947, the station is currently owned by iHeartMedia, Inc.. Its studios are located on Shaw Avenue in North Fresno, and the transmitter tower is north of Visalia, California.KRDU signed on in 1947 on its current frequency of 1130 kHz with 250 watts daytime only.