> Manned aircraft, even quite low-flying ones, are not trespassers — at least so long as they comply with FAA rules on overflights, which usually means 500 feet or higher. Helicopters can go even lower without trespassing so long as they are operating in a safe manner. As a result, unless the drone is quite low, there may not be an actionable trespass at all. And if there is no trespass there may be no intrusion justifying self-help.

http://www.washingtonpost.com/news/volokh-conspiracy/wp/2014...

Edit: Nolo has a page about the issue: http://www.nolo.com/legal-encyclopedia/what-do-when-your-nei...