What is the highest power used by an FM station?
Currently the highest permitted power in the US is 100,000 watts. However, there are many stations grandfathered with higher power levels. The highest, WBCT, Grand Rapids, MI runs 320 kW at 780 ft. This Fetzer Broadcasting station had a CP at one time for 500 KW; and ran as much as 470 kW Horizontal at 800 ft.