KDIA
KDIA (1640 kHz) is a commercial AM radio station licensed to Vallejo, California, and serving the San Francisco Bay Area. It is owned by the Salem Media Group and broadcasts a Christian talk and teaching radio format. Salem also owns KFAX 1100 AM which airs a separate schedule of Christian programming. The radio studios and offices are on Liberty Street in Fremont. KDIA transmits 10,000 watts. By day, it is non-directional, using one of the KKSF 910 AM towers in Richmond on San Francisco Bay. At night, it is directional, using a four-tower array on Noble Road in Vallejo. History KDIA is a separate entity from the station at 1310 AM that held the KDIA call letters for many years. The 1640 AM frequency was licensed as part of an extension of the AM band, and adopted the abandoned KDIA call letters. It signed on the air in . In 1979, a World Administrative Radio Conference (WARC-79) adopted "Radio Regulation No. 480", which stated that "In Region 2, the use of the band 1605-1705 kHz by stations of the broadcasting service shall be subject to a plan to be established by a regional administrative radio conference..." As a consequence, on