[Squawk 8888]

It could be less sinister than you think- ignorance rather than malevolence. From your description it sounds like an advanced ultralight (two seats, ~1000 lb). Circling points and buzzing houses sounds like a couple of fairly common training exercises (ground reference, forced landing) so he may not be aware that he's chosen the wrong place. What is the neighbourhood like- are there lots of open fields around?

As for how to follow up, you have a couple of options. The FAA has a flight service number that operates 24/7, call 1-800-WX-BRIEF. You could also check the flight training firms at the local airport, they usually don't take kindly to students annoying the neighbours.

This thread reminds me again that GA regs in the USA are a bit too loosey-goosey for my liking. As a minimum I think they should require a licence for ultralight pilots.

[CWRWinger]

"This thread reminds me again that GA regs in the USA are a bit too loosey-goosey for my liking. As a minimum I think they should require a licence for ultralight pilots."

Leave the ultralights allow. It's the government personnel who are too 'loosey-goosey'.