BTW: An FM broadcast antenna sitting on 106.3 if I remember the frequency right is actually quite small. Somewhere around 4 feet, four inches long for the radiator and same length for the other side of the dipole. Very easy to hide.
Me, if I'm doing pirate radio, I'm going skywave. Even there, a little power goes a long way. 100 Watts goes around the world under good conditions.
Both.