In 1943, both NBC and CBS agreed to build new shortwave plants in California for the O.W.I. The facilities would be built by the networks under contract to the O.W.I., financed by a government loan, and leased to the O.W.I., who would provide all program services. CBS chose a location at Delano and put stations KCBA, KCBF and KCBR on the air in November, 1944. NBC selected a 160 acre site on what is now called Radio Station Road in Dixon.
NBC engineer Carl Deitsch supervised the design and construction of the million dollar project. Deitsch was NBC’s shortwave broadcast expert, having done the same job previously for its shortwave stations in Bound Brook, New Jersey. He was assisted by others from the crack NBC engineering team, including key men from the NBC broadcast stations KPO and KGO in San Francisco. Construction began in 1943 with the installation of two 50 kW Federal Telegraph Co. transmitters. Rhombic antennas targeted Japan, Australia and the Philippines. Broadcasting commenced on December 27, 1944, with the call signs KNBA and KNBC. The next year, two more RCA transmitters were added, using the call signs KNBI and KNBX.