|Broadcast area||Billings Metropolitan Area|
|Branding||105.1 Star FM|
|Slogan||Billings Soft Rock|
|First air date||1998 (as KBEX)|
|HAAT||100 meters (330 ft)|
|Former callsigns||KBEX (1998-2003)
|Owner||Radio Billings, LLC|
|Sister stations||KRSQ, KEWF|
Prior to December 2, 2008, it was an adult hits station known as "Bill FM". It was launched on May 15, 1998 as adult album alternative Classic Hits 105-1 KBEX. It later changed to the rock format, first as 105-1 The Blitz, then as 105.1 The End in 2003 under the new call letters KNDZ. It switched to KQBL "105-1 Bill FM" on August 26, 2005, and later became Billings' Sports Station "ESPN 105.1". On March 4, 2011 KQBL changed its call letters to KYSX. On March 21, 2011, the station changed its format from ESPN Radio to classic rock, branded as "105 The X". The station was labeled as 105 the X, and features no local DJs, just classic rock music all day long. The station's name was modeled after KRKX-FM's old nickname "The X" when KRKX-FM was Billings's Classic rock station prior to its current country format.
On December 17, 2012 KYSX changed its format to classic country, branded as "Twang 105.1" operated by Anthony Media (who also operates MOJO 92-5), with a focus of country music from the 1970s, 1980s and 1990s. Live Morning Show includes market veterans Jeff Howell and Matt Brubaker. On June 25, 2014 Twang 105 began simulcasting on 107.5 FM thus ending the four-year run featuring Adult Contemporary music as "Magic 107.5". On July 3, 2014 Twang 105 completed the move to FM 107.5 with 100,000 watts, and the New K-Rock 105 debuted at FM 105.1. Both stations are operated by Anthony Media. In February 2015 it was announced that the Michael and Kaitlyn Show would make the move to the new K Rock.
On December 31, 2015 KYSX changed formats from Christmas music to Contemporary Christian music branded as "Crossroads 105.1", "Billings Christian Music Station" using the broadcast services of the Salem Music Network.
On January 1, 2018 KYSX changed format from Contemporary Christian music to adult contemporary and was rebranded as "Classy 105.1" Featuring The Ashley and Brad show in the morning, John Tesh, and more.
- "Station Information Profile". Arbitron. Spring 2010. Archived from the original on 2010-03-01. Retrieved 2011-05-26.
- Billings Gets Classy Radioinsight - February 6, 2018
- Query the FCC's FM station database for KYSX
- Radio-Locator information on KYSX
- Query Nielsen Audio's FM station database for KYSX
- FCC construction permit
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