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This is what a setup for testing airplanes for EMP tolerance looks like: https://en.wikipedia.org/wiki/ATLAS-I Note that this isn't used anymore.

And here's an anechoic chamber for testing military craft: https://en.wikipedia.org/wiki/Benefield_Anechoic_Facility

Now I'm curious to see an A380 in an anechoic chamber... Are full airplanes normally tested in a chamber? Or only the individual systems?

Why do you need a chamber?

Fully anechoic chambers are for antenna pattern testing and scenario testing where you don't want reflections; you want to simulate free space such as planes in the air.

Semi-anechoic is for electromagnetic compliance testing. They have absorber on walls but not floor. Typically don't want signals to get out. Bare floor sort of mimics earth, as ground plane can guide wave.

Some chambers are fully reflective with mode stirrers, but those are specifically for EM susceptibility testing.

Both

I don't think they're gonna let you take your emp device on board

I really hope so. I love to travel.