WJJK (104.5 MHz) is a commercial FM radio station licensed to Noblesville, Indiana, and broadcasting to the Indianapolis metropolitan area. It is owned by Cumulus Media and broadcasts a classic hits radio format. The studios and offices are on North Shadeland Avenue on the east side of Indianapolis. WJJK has an effective radiated power (ERP) of 50,000 watts, the maximum for most stations in Indiana. The transmitter is on Bulldog Road, near the athletic fields for Butler University, which once owned the station. WJJK is licensed to broadcast in the HD radio (hybrid) format.