Some time ago I stumbled across a beautiful little video showing
high-voltage cable inspectors crawling along active power lines,
courtesy of a helicopter and a wire-mesh suit. The video describes this
in terms of a Faraday Cage, but when I repeated this assertion someone
corrected me online with the brief comment to the effect that this is
just the *opposite* of a Faraday Cage. Unfortunately, they didn't
elaborate.
Anyway, my question is this: What are the main physics principles at
work here?