Jim Keller wrote:

Question is, what have others done to prevent antenna connections, such
as ground radials from corrosion at their points of contact?

With copper wires soldered to a copper pipe busbar, I used several coats
of clear polyurethane spray lacquer. Five years later, it looks like
new.

Anything that will keep the water out of the joint between the two
different metals will do fine. The advantage of clear lacquer is that
you can see what condition it's in without disturbing anything.


I live about 5 miles from the Ocean and the vertical is located on a
slope that gets watered at least once a week.

I live in England. The whole country gets watered, several times a week.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek