How about asking the perp what type of ham radio it is something like a
10 meter, etc and when he mentions it you tell him that you have a friend that lives in Australia and ask the perp for his FCC letters (KQX7704 CB, mine) so that you can give your friend a heads up and see if they can get in touch.
Then you let the FCC know that this perp is disturbing the peace, I do not know if you are allowed to hang anttenas from trees, maybe those of you that use ham radios can give us an answer.
Most persons that have that type of hobby will have the call sign probbablly marked on the vehicles so that other hobbyist can get in touch with them, I would look for them on his vehicles then you do not need to engage the guy
navegator