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The way to get blood from a turnip on FM is with height.
Imagine a 5-watt light bulb raised way up 500′ in the sky. It would be seen for many miles.
In 1959 the engineers at 93.7mHz where I worked as an announcer-board operator, while upgrading from 21.5kW to 70kW, experimented by connecting the 10-Watt exciter to the 600′ high antenna, and it could be heard all across the city on sensitive radios.
Although weaker than either of my examples, a Part 15 FM will still do its best if raised as high as possible.