W8JI:
>The feedpoint inside the box is already isolated with
over many thousands of ohms impedance.
You would go broke doing that with beads.
>If you want to improve isolation further, ground the
feedline some distance away with a grounding block and
ground rod. Any added impedance near the box is a wasted
effort.
K5NA:
>I saw this post and got excited about buying some of
the beads. Especially since they seemed so affordable.
Seems like this was mentioned recently, but
another alternative to a ferrite sleeve is an
isolated 1:1 transformer (e.g. 3 turns on both
sides of one BN-73-202 binocular core) and ground
only one side to a ground rod. One core is much
less expensive than 100 of the FB-73-2401 ($0.60
vs $15.00).
73, Bill W4ZV
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