CIHR-FM is a Canadian radio station broadcasting at 104.7 FM in Woodstock, Ontario. The station plays an adult contemporary format branded as 104.7 Heart FM and is owned by Byrnes Communications Inc. The station's signal reaches most (if not all) of the London-Woodstock-Tillsonburg area (as Nielsen BDS describe the station as a London, Ontario station), and under extreme conditions (such as fog), the signal reaches to just west of Chatham-Kent, Ontario before it begins to interfere with Toledo, Ohio's WIOT-FM, which is also on 104.7 FM. Since the flip of CIQM-FM from AC to hot AC in 2010, CIHR-FM, along with CHGK-FM in Stratford (which has since shifted to CHR as 107.7 2Day FM) are the only AC stations serving London. CIHR-FM has to provide protection to the East because of CHUM-FM, which