Check with Texas Towers
URL:
http://www.texastowers.com/aluminum.htm

Saw a calculator there some where but can't find it now -- maybe send em an
E-Mail
salestexastowers.com

--
Lamont Cranston

The Shadow Knows
"Angela & Gary" wrote in message
...
I am planning a 20m vertical dipole array here (no room for a tower -
yet) and am seeking some advice on the sizes of nesting aluminum tubing
to ensure adequate strength. I've looked about in what I think are the
usual web and non-web places and can't find any formal discussion.
Anyone know of such a discussion or can perhaps lend some anecdotal
info. Thanks very much in advance.

Gary
KA9RAO