My KLM 40 has been up at 140' for 10 years without a problem.
It's heavily modified, as you might expect!
For the shorting bars, I drilled through the clamp (the formed flat
stock) and the tubing, and put in a #8 stainless steel screw
with stainless nylon locking nut. All the element joints are done
like that, too.
I'll describe the element to boom brackets, if people are interested.
73, Howard WZ6Z
> Beware of any aluminum type clamp which involves the formation of
> the aluminum strap into a loop to fit the size of some tubing, and
> clamped with a machine screw and nut. The shorting bars on KLM 40
> meter antennas are this way, and they have caused me all sorts of
> headaches. I'm still trying to figure a good design for those.
> 73, Rod N4SI
> The DXer formerly known as N9AKE
> (c) 5 November, 1996
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FAQ on WWW: http://www.contesting.com/towertalkfaq.html
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Sponsored by Akorn Access, Inc & KM9P