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"The conections are inside of the mast and they are covered up but still experience some corrosion every year "
Rick, that just means you have UNSEALED connections located inside the mast. Shelter is not enough, they must be sealed. As SD mentions, a good silicon grease will go a long way. Sold as "dieletric grease" "vacuum grease" or "high temperature brake grease", it doesn't migrate and it allows the direct metal-to-metal contact under it while blocking all water/air from entering.
Depending on how you buy it, from $4/oz. to $4/8oz. for what is mainly the same product.
If you start with a commercial grade fitting, which has water-resistant fittings (i.e. o-rings) in the cable entries, and fully tinned (corrosion resistant) contacts for the wires, and you pack the fitting with the right grease before securing it, it will exclude even salt air and require zero maintenance.
The alternative is to pack whatever other connector you can find, and then cover it with adhesive filled heat shrink, or "coax seal" aka self-vulcanizing butyl or silicone tape, which forms a single rubber vapor-proof boot over it.
Even with those seals, water vapor can migrate inside of inferior wiring, especially braided wires. There is air in the braid, and every time the wire warms up the air goes out, to be replaced as damp air is sucked in when the wire cools down. So, selecting better grade wires and sealing them at BOTH ends, is also a good idea. That can be more silicon grease, or liquid vinyl applied in multiple layers. But the point is, once you appreciate all the ways corrosion can get in--you can keep it out. It takes some extra time and money, but even a good dose of silicon grease can be "enough" to get you through yearly usage.