ive been reading up on this kind of thing on the net just today. i never tried "modified microwave oven", just microwaves. ive found a wealth of information. Neways, i read about the resonant chamber and the like. I would only have it on for short periods of time. Just how big is this RF field anyways? as i mentioned earlier, i want to try and see if I can jam electronic devices, not so much destroy them ( although that would be fun), so i wont be using such high power levels.