It's not like copper is unobtainium. At at least one hamfest I go to a
year, there's someone selling off long bars of copper that are drilled out,
sometimes tapped, for use as SPGs, radial plates, what have you, any
situation where a bunch of straps, wires, braid have to be at the same
potential. I was at a fest a few weeks ago where a guy was selling bars 2
or 3 feet long out of breaker panels, for $3/pound.
The prob. with Al is you have to have a go-between if you want to connect
copper to it, usually brass, which is certainly doable -- you just need to
get the brass nuts, screws and washers, but it's an extra hassle and expense
you don't have to deal with if everything is copper--you can just braise or
use regular hardware (non-zinc).
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