I've thought about beverage and part 15 and I know this is another gray area so we have to be careful not to get that one closed. But it may meet 15:209 for field strength away from the water lol. But since the planet has water under and around the earth that one would be hard to hammer down. Remember if it doesn't meet 15:219 it would default to 15:209 and since a beverage antenna is made from nature how could you slam a part 15 operator for using one? I almost tried this in Michigan too as remember it is surrounded by the Great Lakes. We had a river really close to the house and a basement. Well two things crossed N8DEF's mind when we were talking about this. The damn river was right under the power lines. And we had one less than a few feet away from my house. We could have intentionally made a beverage antenna and tuned up to it and ran a 100 mW AM station. Or even less and still met the field strength requirements for compliance. I don't think or have seen any NOUO's for a beverage antenna. Fun facts to play with here for Micro Broadcasting on AM.
A reminder that pure water is an insulator. However there may be enough impurites in the water to enhance your signal. (Rich insert comments here)
I know we had a lot of iron in our water. We really had to soften our water as it was really hard water. Our creek too ran through a metal Calvert which was quite long and ran under the road for our subdivision. That too could act like a conductor and make the signal travel to a certain extent.
FM really is a different beast all together.
When I pirated (yargh!!) I got roughly 6 miles broadcasting in mono with 15 watts and a 1/4 wave antenna sitting around 30 feet in the air. On a clear day I could push 8 miles.
Wow and there was a dude. On Facebook that got 20 miles on a dipole with 500 mW. It shows how the environment can effect range on low power. Nust food for thought.