Hi Bob ... I applied Permatex anti-seize to the bolts on my tower and the
boom-mast-rotor hardware. The whole works came apart smoothly after being
up for 20 plus years. The material I used between the Al junctions on the
TH-6 was supplied by Hy-Gain in a little metal pill box. Likewise the
stuff
worked great. SS hardware used on the antenna.
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In the UK a very good stuff for outer metal protection is Finigan Waxoyl,
available from many autoparts - and hardware shops.
Living in a windswept area near seawater ,hence with a lot of salt spray ,I
use it on all bolts and nuts and galvanised metal clamps etc.
Of course it is NOT suitable to make galvanic contact between (dissimilar)
metal parts.

Frank GM0CSZ / KN6WH