
Re: Wireless Signal
This won't be a problem. First - the shells won't have a permanently activated receiver. You're not exactly going to surf the net with them.
The power supply is probably a chemical battery which is activated when the shell is fired. As I understand it, the shell is told to explode after a certain number of revolutions, and it gets told on its way down the barrel. The sensible thing to do would be to ignore any further signals after that. Its therefore very unlikely that they could be subverted.