On Mon, 04 Oct 2010 19:31:38 -0700, Art Unwin rearranged some electrons to
say:

Antennas usually are made of aluminum as copper is somewhat heavier and
silver and gold is to expensive. Since lead is now banned in a lot of
places especially with solder you can now buy solder that is doped with
Bismuth !
Now you can't coat your elements with it but if you have a solder bath
you can run copper wire thru it. The bismuth is brittle but with the
underlying copper it is stiff enough to stick it on the antenna
elements. I am assuming that the applied current would travel along the
bismuth coating instead of the aluminum and therefore should increase
gain for antennas that use coupling methods such as the Yagi tho
bandwidth may well suffer some what. What do you think?

Lead free solder is still mostly tin.