Originally Posted by Boggie Dog

I'll be the first to admit that I am no expert on electronics.

That being said I also know that modern RC systems used by people who fly expensive remote controlled aircraft have excellent frequency discrimination. The newest equipment has very narrow frequency bands and are discreet enough to reject all other signals.

The receivers are very small, so small that they easily fit in a 2 meter glider with all servos and batteries needed for flight with room left over.

Now I don't know if a person who has a better understanding of these things could fashion a trigger for a weapon from them but I betting they could.