Yep - Faraday cages are remarkably simple devices. I was always amazed to find Signal folks setting up their OE-254's on hills surrounded by high chain link fence. If they didn't watch where their antenna was in relation to the fence, part of its line-of-sight actually went through the mesh, coincidentally right where the "outage" was reported. It's amazingly simple to shield devices from RF energy, just about anything metal whose openings are 1/4 the wavelength will block the signal.

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Countermeasure Too Simple
The use of directed lightening or high frequency electricity is a ridiculously simple thing to counteract. After watching the video of the JIN in action it took me about one minute to remember something. Anyone who has any schooling in electrical science, or for that matter, anyone who has ever attended a high voltage electric show at a science museum knows that a simple piece of metal screen from a screen door will redirect and absorb the high voltage electricity and keep anything contained within safe from the effects. Don't think I'm giving the insurgency any ideas they haven't already thought of. (Not to mention the thing doesn't work anyway.)
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