> wrap that in aluminium foil, making sure that the ends are folded over and pressed down hard to provide good inter-layer contact
I've tried this many times, it's impossible to prevent gaps without welding it shut. Obviously I wasn't testing with an EMP or nuke, but trying to block 2.4GHz WiFi... But that is well within the E1 range the author states.
I think the problem with folding is it's too uniform, it's still too easy for waves to propagate through the humanly imperceptible gaps with only a few reflections.
The only method I found that worked consistently was to wrap many layers randomly overlapping and crumpling previous layers. My theory as to why this works is through self interference due to creating a long signal path with highly randomised reflections... No idea if that would help cancel out EMP.
I've tried this many times, it's impossible to prevent gaps without welding it shut. Obviously I wasn't testing with an EMP or nuke, but trying to block 2.4GHz WiFi... But that is well within the E1 range the author states.
I think the problem with folding is it's too uniform, it's still too easy for waves to propagate through the humanly imperceptible gaps with only a few reflections.
The only method I found that worked consistently was to wrap many layers randomly overlapping and crumpling previous layers. My theory as to why this works is through self interference due to creating a long signal path with highly randomised reflections... No idea if that would help cancel out EMP.