The story
FM Haro! started broadcasting in Hamamatsu as a mini FM radio station with a low output power to qualify as a community FM radio station. It increased the output power to 20 watts in 2000 and moved the antenna to Act Tower, the tallest building in Hamamatsu, in April 2004, resulting in much wider broadcasting area.
From Wikipedia’s article on FM Haro!, shared under CC BY-SA 4.0.4