>> a Faraday cage yes, but grounding doesnt do squat <<
I ground all of my Faraday cages!
(All of those grounds are connected to one another via no. 6 AWG cable, plus being connected to the main electric service ground, per the NEC. And for good measure, all of the above are connected to a separate 8-foot copper grounding rod that’s as close as possible to the Faradays.)
“I ground all of my Faraday cages!”
Tough to use an earth ground in a car or plane. Faraday cages do not need one.