@Pkveazey
i've always been fond of a tuned spark gap.
12 vdc battery, to an old fashioned coil (from a car or truck) to a sparkplug in a tin-can.
attach the can to an antenna tuned to your favorite frequency or even use a directional antenna.
if you rig 3 or 4 omni's offset by a few hundred yards - the system interferance will mess up the 0pf0r int3rfer0metery (read, they will have a hard time finding the emitters). the antenna is your filter - 1/4 wave at close range works. so 2 coat hangers in a boxkite config works. the white noise off the sparkplug is your RF source. if your math is good, calibrate the can and skip the antenna. I saw one op where someone attached the output to a perimeter fence
using a nearby power point on a light pole - into a 14VDC inverter. the EW guys finally cried uncle and asked the red team what they had done - i was sitting in on the AR.
one other 'cute' trick - if you can get close enough to mess with their coax - put your 'noise maker' mentioned above near their generator earth ground and leave. The noise floor on their AC powered gear or gear plugged into an inverter will loose them 30+dB of sensitivity. the trick is to mess with the earth ground - it leaks into the ground plane on the receivers. Most rigs RF filters are on the input side.
ask anyone who has used RF gear with a generator and forgotten to double check their earth ground. this won't blind high end gear but mobile gear is very susceptible to this when using shore power.