Hi

Had some mysterious crashes recently at our field , near Reykjavik...... Iceland.
For no apparent reason planes are going in, after much investigation we belive we are being shot down by some unhappy people that have a football field adjacent to ours, each time a plane is lost it was noticed a car next to the field,we belive this person is the culprit.
IS THERE A DEVICE AVAILABLE THAT CAN DETECT SOMEONE NEARBY DELIBERATLEY BLOCKING CHANNELS.............................
I WILL NOT FLY MY JETS UNTIL WE CATCH THE CULPRIT.

THX