I know I had some issues with the antis while up in NY, but nothing like flying around them. (probably DNR)
Everyone else is right. Get the number (usually on the vertical fin or along the engine cowling) and call it in.
Were you on gov't property? I have to ask because we have low level training on alot of state and federal land. I had some buddies fly down a lake one evening on our approved NOE route accidentally surprise some goose hunters and got shot at. Needless to say, the goose hunters lost when law enforcement showed up.

AIR CAV!