"RST Engineering" wrote in message
...
Detecting it is one thing, stopping it is quite another kettle of fish.

So tell you what, I'll give you a scenario, you give me your
countermeasures and I'll defend against it.

Your scenario:
CW emitter using a watt of erp semi-isotropic radiation inside of a
"static proof" bag (fairly decent radar stealth shielding at the frequency
in question) in a plastic bucket under a helium weather balloon. Power
source (inside the bag) is a small garden tractor 20 amp-hour battery. A
watt of RF requires about 2 watts of dc power, or about 170 mA from the 12
volt battery. That's roughly 120 hours (5 days) of operation on a
continuously moving target. Do a little winds aloft calculation when
filling your balloon and you can drift them across the country, doing a
wide area blankout for days at a time.
My defense:

EMP (you didn't mention cost ,feasibility, or collateral damage)

Your countermeasures:

????