The station first signed on the air on May 6, 1992, as KKAK; originally operating as an
independent station, it aired a mix of
infomercials,
religious and
home shopping programs. The station changed its call letters to KKAG in 1994. In 1998, KKAG was sold to Paxson Communications (now
Ion Media Networks). On August 31 of that year, the station became an owned-and-operated station of Paxson's family-oriented television network
Pax TV upon its launch, and changed its call letters to KPXF. In 2003, Paxson sold KPXF to
Univision Communications, creating a duopoly with Univision O&O KFTV (channel 21); after the sale was finalized, the station's calls were changed to KTFF, it also became an owned-and-operated station of Univision's secondary network TeleFutura (which relaunched as UniMás on February 7, 2013). Univision subsequently purchased
Shop at Home affiliate KAJA-LP (channel 68, now on channel 41) from Cocola Broadcasting to become a fill-in translator for KTFF, adopting the KTFF-LD call letters (ironically, the KAJA calls are currently used as a brand name for
low-power station
K68DJ in
Corpus Christi, Texas, which also broadcasts on UHF channel 68). In 2007, the
Federal Communications Commission (FCC) issued an order concerning KTFF and former owner Paxson Communications, denying a review of the sale of KTFF to Univision; it also implemented a deal with Christian Network, Inc. (CNI), parent company of
The Worship Network (which formerly carried its programming on Pax TV's stations as both an overnight block and later as a dedicated subchannel service), giving the religious broadcaster the right to program KTFF seven days a week from 1 to 6 a.m. In addition, the station was required to provide a digital channel for CNI's exclusive use (so long as certain conditions are met), after KTFF signed on its digital signal, if it used two or more subchannel slots. However, , KTFF broadcasts UniMás programming full-time, though the date the station stopped carrying The Worship Network is unknown. It is also unknown if the discontinuance is tied to Pax's successor,
Ion Television, ending carriage of The Worship Network in 2010. ==Technical information==