Originally Posted By: Arney
I'm thinking about this...a Faraday cage needs to be grounded...
A Faraday cage does not need to be grounded. It's not the same thing as a lightening rod.

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and it also doesn't allow EM signals to pass through...I think cars and planes fail on both counts. Well, a car is grounded but not well grounded. But I can definitely make a cell phone call from inside each vehicle, so EM can pass in and out.
It depends on the wavelength of the signal. Cell phones use very short wavelengths so their signal can penetrate through small holes.

People here are saying that a military EMP would have much longer wavelengths that would be blocked. I don't know if that's true. Also, I'd be wary about extrapolating experience gained from EMPs that were mere side-effects of a nuke, to EMPs that were specifically designed as weapons in the own right. There may be ways to put the energy into short wavelengths to cause maximum electronic damage.
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