When a car or plane
is struck by lightening the metal body acts as a Faraday Cage,
excluding electric fields from the inside.
The platted wire surround of a coaxial cable
shields the inner wire from unwanted electrical signals.
Tele Satellite
International, March 2003, reports that Iranian authorities
are jamming incoming international Q-band satellite signals with
very high energy microwave emissions.
Solution! - a wire mesh Faraday Cage. To effectively keep
the jamming signals outside the cage. The holes must be one quarter
wavelength or less in diameter. In this case, with a 12.5 Gigahertz
signal, that is 0.7 cm.