With regards points 5 & 6 and primitive jamming equipment it can be inordanetly effective.

Essentially an electrical spark or arc contains a very broad band of frequencies at just about whatever power you would like.

For instance take a DC motor (12V) and use it to drive a modified car distributor this will produce a quite useful set of pulses especially if you know a little bit about how to use an auto transformer to up the spark gap voltage.

If fed into an appropriate "long wire" antenna this can jam out MW radios and HF radios over several square miles (I've tried it in the past and know it works ;)

Now the problem with such a system is it's mainly low frequency interference not UHF and microwave.

However there is a way to do this with a "top hat spark gap" the Victorians were known to have produced kilowatts of microwave power with such systems [1].

The basic design is a sphere shaped electrode in a tube which is sealed at one end and has a plate at the other (it looks like a top hat) if you get the measurements correct such a system will generate some rather useful very broadband energy in the UHF and microwave bands.

Such a system could be put together very simply and easily from cooking oil or auto oil drums and any metal plate from old vehicles etc.

[1] K.L.Smith "Victorian Microwaves" Wireless World, Sept 1979.

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