A quick note on  a protective coating for aluminium:

You might like to look at Alocrom 1200 (Alodine 1200 outside Europe) which can be hand-applied to preserve and protect aluminium from corrosion, retaining its conductivity. I used it for many years in industrial and military applications, where it is applied more thickly but for our purposes it produces a pleasant gold colour. You can mix small amounts for small areas that need protection. Surfaces need to be scrupulously clean first.
Over here a 1kg kit can be purchased for around £40 including delivery.
Here's the instruction leaflet:

David, G3UNA

2. Is there advantage of winding the coils of copper vs. aluminum? Is it worth silver plating the copper windings? I'm most likely planning to use 1/4" tubing either way.
Both materials will tarnish (oxidize). Since aluminum is already oxidized, I would go with it, since we are both in AZ where, until the big one, we are removed from salt air. Silver plating is a waste, IMHO, and not necessarily of any benefit. See: http://k6mhe.com/n7ws/Plating.pdf

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