The company is owned by the MBS Media Holdings, Mainichi Shimbun, and the Aso Group.

The initials RKB stand for Radio Kyushu Broadcasting (ラジオ九州放送, Rajio Kyūshū Hōsō), the station's former name.

[3]: 21  On 12 April 1951, Radio Kyushu received a preliminary license,[3]: 10  and on 7 October of the same year, it began trial broadcasting.

The designer was Hatano Yoshiko, a middle school student in Oita Prefecture.

At the same time, the station merged with Mainichi Seibu Television (tentative call sign JOGX-TV, later reassigned in 2013 after CBC TV spun off).