 The station first signed on the air in October 1986, and was built and signed on by the Trinity Broadcasting Network.KTAJ is the only full-powered TBN station in the state of Missouri, and was one of only two stations licensed to St. Joseph—alongside ABC affiliate KQTV (channel 2)—until the June 2012 sign-on of Fox affiliate KNPN-LD (channel 26) – although KTAJ and KQTV remain the only full-power television stations licensed to the city (two other stations owned by KNPN parent News-Press & Gazette Company have signed on since that point – low-powered KBJO-LD (now KNPG-LD; channel 21) and KNPG-LD (now KCJO-LD; channel 30)).As KTAJ-TV's virtual digital channel is mapped as "16" (its former analog channel assignment) through PSIP, NBC affiliate KNPG-LD instead maps its PSIP channel as virtual channel 21 to avoid co-channel mapping issues with KTAJ.