The channel 20 allocation in Salt Lake City was originally occupied by KSTU (an independent station at the time, now a Fox affiliate) from 1978 to 1987.

As part of a deal that was approved by the Federal Communications Commission (FCC), the KSTU intellectual unit moved to channel 13 in 1987 and currently operates under a separate license.

The station would run shows like The 700 Club, Joyce Meyer, James Robison, and others; the original meaning of the calls stood for "The Master's Way".

[3] On July 30, 2015, Airwaves, Inc. filed an application to sell KULX-CD and KULU-CD to Serestar, who immediately took over the station's operations through a time brokerage agreement (TBA).

Serestar agreed to sell KTMW, KULX-CD, and KULU-CD to NBCUniversal on November 28, 2018, as part of a $21 million deal;[6] that transaction closed on March 5, 2019.