I have a problem with corrosion on my TV aerial. It's made mostly from aluminium but is held together with 3/16 inch galvanised steel screws, as are all the aerials that I see anywhere.
There are 11 round elements, 6 of which are electrically connected alternately together by flat pieces of aluminium giving a total of 24 pieces of aluminium that touch each other, clamped together by the screws.
About every six months TV reception gets bad, and I fix this by taking the aerial apart, sanding the surfaces and putting petroleum jelly on them. I used to use CRC but that lasted only a month.
It's really difficult to do this because the aerial is 10 metres up on a roof with a 60 degree slope. TV reception is really bad here so I need a large outdoor aerial as high as possible.
I have tried to get aluminium screws but without success. They would probably be too weak anyway. I imagine that stainless steel screws would still cause a problem.
I have considered taking it somewhere to weld the connections together but it's about 2 metres square and fragile and rather hard to transport.
Any brilliant ideas?