[Boogieman]

Just find out the radio frequencies the major manufacturers use and build a jammer for those frequencies.

[Vinnie]

I think many of them use the 2.4 gig range.
Maybe a microwave oven magnetron could be used to create the r.f. and a parabolic antenna to aim the waves.

[taxcontrol]

Jamming radio frequencies is often a violation of federal law.