Re: Back to that drone. On BBC Iran says it electronically hijacked and landed it.
It would seem to me to be relatively easy to jam, simply overwhelm it with electromatic radiation to the point it couldn't receive it's control signals. I believe in that case it's supposed to return to it's base, but I'm not sure of that.
I spent a few days in Tucson a few years ago, stayed with my cousin. Their neighbor was a guy who was training to fly one of those things. So far he had had significant training and was in simulators only, but flying realistic missions.
He had lost 3 simulated aircraft, and was a long ways from being qualified. Apparently it's very hard to meet the proficiency standards necessary for flying secret equipment over unfriendly territory.