Doof doof zapper

These aren't radios, they're CD players or whatever, probably pretty well shielded against RFI, considering they operate in a car.

I once saw a small air horn in the impulse aisle of the local general store. If he's got his window open, just give him a blast. ;-)

Cheers! Rich

The EMP wouldn't disrupt the noisemaker, but it could zap the ECU and strand the car in the middle of the street. ;-)

Cheers! Rich

how about a kilowatt, in the 2.45Ghz ISM band, the cavity magnetrons are easily had, getting the waveguide right for directionality would be the tricky bit.

If 4W omnidirectional from a GSM phone can get in and cause noise, a directional kilowatt from a little further away should peg the drivers

About as legal to use for this purpose as the handgun posited by some other. harder to aim, and less use in a disagreement.