VHF antenna mounts and Electrolysis

[Brion Toss]

Hello and welcome,
I think your letter assumes ideas that are not accurate. The L-bracket should make no such electrical connection, except that from the juxtaposition of dissimilar metals, if I understand it correctly. And even if it did, the result would not be electrolysis (look it up). Therefore make sure that you don't have live current going to the mast -- it should be contained inside the wire -- and be sure to use Tef-Gel on any dissimilar metals that will be in contact with each other.
As for the keel bolts and lightning protection, do you really want a strike to come into the saloon? Seems like it would just fry you on the way to blowing the keel bolts off.
Fair leads,
Brion Toss