You can buy harddrawn copper, was used in mining applications.
Paul
W3PLP
Sent from my iPhone 6 plus
> On Aug 6, 2017, at 2:40 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>
> The problem with using ordinary copper wire for antennas where the wire is
> under tension is that it stretches. Mine high dipoles are under about 100# of
> tension (up 140 ft, fed with RG11), so every few years, I have to let down my
> 80/40 dipole that's built with #10 THHN stranded and circumcise it to keep it
> on frequency. I've since migrated to using #8 bare solid copper that I've
> stretched by tying one end to a tree and the other end to the trailer mount
> of my SUV and pulling slowly until it breaks. The result is close to being
> hard drawn, roughly AWG #9, and about 15% longer. Antennas that I've built
> with this seem not to stretch. Over the years, W6GJB and I have done this
> with at least 2,000 ft of #8.
>
> 73, Jim K9YC
>
>> On 8/6/2017 10:44 AM, Clay Autery wrote:
>> Correct... THHN is not intended for use as exterior antenna wire, but
>> it surely does work well... I can get it in any color I want and in a
>> 2500+ foot spool, et al.
>
>
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