It is possible to shield the electrical part of noise on a ferrite antenna, as we only use the magnetic part.
The Shield can be made of any metal. - I have used thin brass, but it can be any metal
There MUST be a slit, or the signal will be shorted.
Use a heavy wire to short the electrical signal to ground.
If the shilded cable between the the pre-amp and the controllerboard are more than a few meter,
also use ferrite beads at both ends to short unwanted signals.
( any wire will pick up unwanted signals, but with ferrit we can eliminate it )
See photos !
Br
Richo