The station was assigned the call sign KAYI on November 10, 1997. On November 7, 2000, the station changed its call sign to the current KTOH.[2]
HD Radio
The station operates two HD Radio subchannels, classic hitsSunny 101.3, and active rock107.9 The X. Both channels' present formats launched in February 2023 to replace oldies and Hawaiian music/tourist information formats respectively. Both stations are simulcast in analog on the low-power translators 101.3 FM/Kapaa and 107.9 FM/Kalaheo respectively.[3][4]