Tin plated wire has higher resistivity than solid copper wire. However,
in nearly all common antenna applications, the loss of even tin plated
wire is insignificant. So it's just fine to use. Likewise, stranded vs.
solid wire. Any of the above are just fine.

As for Copperweld, I googled "copperweld" and immediately found that
Davis RF carries it. I'm sure that you'd find several other dealers if
you'll invest just a couple of minutes looking through search engine
results.

Roy Lewallen, W7EL

Denno wrote:
Hi. I have spool of #12 industrial grade tin coated copper strand
wire that I had planned on building a 40 meter vertical loop with.
While scouring the web, I came across a white paper on wire, tubing
and RF compatibility, and it said that tin-coated copper was "somewhat
inferior", but silver coated or pure copper strand were fine for
antenna use. Contrary to this, I have read in this Newsgroup that tin
or silver coating is a must-have for good RF radiation.

Any views on tin coated copper strand?

Also, where do you all find Copperweld? It sounds ideal, but I
haven't been able to find it anywhere.

Thanks!