KOB-TV started operations on November 29, 1948, after Albuquerque Journal owner and publisher Tom Pepperday won a television license on his second try. Pepperday, who also owned KOB radio (770 AM), had previously applied for one in 1943. It is the oldest television station in New Mexico, as well as the third-oldest television station between the Mississippi River and the West Coast (behind WBAP-TV (now KXAS-TV) in Fort Worth, and KDYL-TV (now KTVX) in Salt Lake City). Initially, channel 4 ran programming from all four networks—NBC, ABC, CBS and DuMont. However, it has always been a primary NBC affiliate owing to its radio sister's long affiliation with NBC radio.