KTSO (100.9 FM) is a commercial radio station licensed to Sapulpa, Oklahoma, and serving the Tulsa metropolitan area.

Its HD-2 digital subchannel carries a Contemporary Christian format, which feeds an FM translator at 94.5 MHz, K223AU.

The AM station had a full service format of middle of the road music, with local news and sports.

The tower was part of an FCC granted Class C3 upgrade, increasing the station to an ERP of 19,000 watts.

Several inner-ring Tulsa suburbs such as Broken Arrow, Claremore and Okmulgee only got a grade B signal.

Other veteran announcers included Bob Michaels, who joined the station in 1998, and Gary Thompson 3pm to 7pm, who began intermittently working there in the early 1990s.

[7] On October 20, 2020, at 3 p.m., the “Totally Awesome 80s” format moved to translator 94.5 K233AU, which rebroadcasts KTSO's HD-2 sub-channel.

That marked the return of the All-Christmas format on Tulsa radio since KTGX-HD2 began stunting as "Christmas 93.5" in 2018.

[9][10] The HD2 subchannel simulcasts on translator K233AU (94.5 FM) in Tulsa, and broadcast the former '80s Hits format that was on the main signal.