The station went on the air as KBLR-FM on April 23, 1979. On July 18, 1979, the station changed its call letters to KYOO-FM. This station served the Bolivar, Missouri, area but could be heard in Springfield.
On October 10, 1989, KYOO-FM 106.3 was sold. The station was moved to 105.9 and became the current KGBX-FM primarily serving Springfield.[3]
The city of license was eventually moved from Bolivar to Nixa.