"Loose Cannon" wrote in message ...
I would like to get a device that I can install in my car which would emit a
frequency that would mess up any cell phone signals within 100 feet or so of
my vehicle when I activate the device.

No, what you really want to do is send some sort of malformed signal
to the phone, scrambling the battery management software, and making
the Li-Ion battery explode whilst they're using their phone. Causes
_great_ injuries and discourages phone use !!