No idea on exactly that one, but basically all you need is a magnetron from any discarded microwave oven, a horn made from some beer can(s), some LV power for t

No idea on exactly that one, but basically all you need is a magnetron from any discarded microwave oven, a horn made from some beer can(s), some LV power for the magnetron heater and an electroshocker as HV pulse power supply. And some presense of mind to not point the horn at any EM-reflective surfaces.