By Tom McLaughlin

The first I ever heard of “Electro-Magnetic Pulse” or EMP was 20 years ago when the Pentagon wanted to build a series of low-frequency AM radio towers — one of them a few miles from my house in the cornfields of North Fryeburg, Maine. In case our enemies exploded a nuclear device high in our atmosphere and fried all electronic communications, the towers would survive and allow our forces to orchestrate a counterattack. The Pentagon called the system “GWEN,” or Ground Wave Emergency Network.

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