We've been here in our club last year. Tried to be nice, first offered free membership and to pay for his AMA, then we set up a freq agreement. He said he'd come put up a pin, then we could call him to see if we could use that channel. Didn't happen. We lost several planes, and he lost all of his. Showed up one day with a TOASTED NEW GP PT-19. We've never heard from him again, but who knows?

Fact: you have no more right to use a channel than him, regardless of your established history. There are no such provisions in ANY law or regulation.

Fact: Unless you can PROVE he brought out his tx for the EXCLUSIVE purpose of harming your property (plane), there is no "malicious intent ".

Final thought: any legal action will most likely cost you much more in the area of future bad blood than any other option, and will bring bad attention to the hobby. TRY to meet him half way, or for that matter beg, plead, and throw money (membership) at him. And ignore the "What if other members do that?" stuff, how silly.