It is certainly true that the proliferation of spy helicopters will get out of hand next summer. And I wonder ho long before some terrorist loads one up with some really high explosive and sends one into a packed stadium, or someplace else. I do have a defense system against such devices, they have no defense against it. I have an airgun with a large-bore barrel. Picture an old sock full of sand at about 600 feet per second. That will take down any of those helicopters. It is even more effective if I use two smaller socks with a rope between them. Unlike the plastic airguns that may burst, these use old CO2 fire extinguisher tanks rated for 1800PSI, so at 150 PSI they have no bust hazard. Also, they are fairly quiet and have no muzzle flash. A very effective anti-spy-copter device.