The term Faraday screen, sield, or cage, has been applied to perforated
continuous sheets of metal in this thread. That`s generally wrong.

A Faraday screen, shield, or cage is a network of parallel wires or
strips connected together at one end but disconnected from each other at
their opposite ends. I`ve worked at several broadcast stations which
used Faraday screens at every tower to magnetically couple the tower to
the feedline while eliminating all capacitive coupling. The purpose is
to disadvantage harmonic coupling to the tower in which capacitance
favors due to lowered capacitive reactance at the harmonic frequencies.

At the stations, two coupled coils are used. They are close together and
share the same axis. Between the two coil forms is erected a heavy plate
sliced with parallel cuts. These start at one edge of the plate but end
before reaching quite to the other edge. The purpose is to eliminate
capacitive coupling between the coils but to allow tight magnetic
coupling between the coils. In the broadcast station they also have
another salutary effect. The tower`s lightning strikes nearly all are
terminated on the Faraday screen and kept out of the radio equipment.

A Faraday screen, shield, or cage is a network of parallel wires or
strips connected on one end but disconnected from each other at their
opposite ends. It`s similar to a conductive comb. The connected ends of
the wires are usually grounded.

The open-circuit wires prohibit circulating current from wire to wire.
Fields of the induced current would cancel the field of the inducing
current thus canceling inductive coupling. Due to the gaps, the screen
is transparent to the magnetic field but the wires capture the
electrostatic lines of force and eliminate capacitive coupling through
the screen.

A screen properly grounded at both ends of the wires sliminates magnstic
and electrostatic coupling. It is a shield but not a Faraday shield.
A continuous conducting shield is not a Faraday shield, even if
perforated with small holes. A lot of screened rooms have been
constructed from copper window screen. It decouples the contentents of
the room from the whole world when done correctly.

Best regards, Richard Harrison, KB5WZI