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Happy FM 91.7 Koronadal is a music FM radio station owned by the Notre Dame Broadcasting Corporation in the Philippines. The studios are located at Reyes Blk. 2, National Highway, Brgy. Morales while the transmitter is located at Roxas Mountain Range, Brgy. Paraiso, Koronadal City. It operates daily from 5:00 am to 2:00 am.