“And for it to be effective it needs a copper foil lining.”
You sure about that? Copper is pretty darn conductive . . .
Copper gives you protection against electromagnetic fields that is second to none.
It is also anti-bacterial so if they try to get you with their brain germs you are ready.
It does not protect against mind worms though.
There is no protection against that.
Keep your flame thrower by your side.