Wow! He must have some really long control lines!
Our local Air Base has made it illegal to fly RPVs for this very reason. I called the base Point of Contact to ask about C/L aircraft, but the captain didn't act like he understood what I was talking about...until I said "You know, the models your grandfather may have flown." Then he said, "Yeah, I don't know if they are illegal. Let me call you back." Good thing I'm not holding my breath waiting!