🚀 go-pugleaf

A friend who works for a large military electronics contractor doing
electronic warefare kinds of thing once told me that the way to build
a cheap sparkplug-based jammer is to construct a waveguide by gluing
aluminum foil around a piece of 2 by 4.  The plug is screwed into a
hole bored in the side.  The broadband rf from the plugand the
gadget is very crudely tuned by cutting it to an appropriate length
and placing the feed at an appropriate place from the closed end.
Doing this makes cuts down on the interference you generate by limiting
the bandwidth and making it more or less directional.  Of course, you'll
still wipe out most radio communication ahead of you and you might
even manage to jam the pacemaker of the little old man careening
towards you in his Cadillac.  Although it's doable, it's still a bad idea.