Some years ago, I made a Faraday cage using a metal box and put my short wave and emergency radio in there.
This video was very informative. The country is just toast if this happens. Not many people would live through this. Suddenly it happens with no time for preps if an enemy does it. If the sun does it, the film says we have three days before it gets here. There would be major panic and I wouldn’t want to be in that panic. That’s why it’s important to be able to isolate yourself/family, immediately. After the initial panic, your situation might change so you could be in the open. I won’t be in the open.
Almost everyone has a Faraday cage today.
It’s in your kitchen.
It’s called a “microwave oven”!