> Has anyone erected a Sigma 280S 80 meter beam ...
> A friend of mine is considering the installation
> of such a beam antenna on a Rohn 25 at the
> 80 foot level.
My seat-of-the-pants says this is too much antenna for Rohn 25. Also,
assuming DXing is the object, 80 feet height for a yagi is pretty low in
terms of wavelength - it would be like trying to work DX with a 20 meter
beam at 20 feet - possible but far from optimal. If DX were the object,
your friend could save a heck of a lot of effort and money by using the 80
foot tower as the central support for a 4-square made of wire. That would
get a whole lot more of your friend's signal into the DX station's ears, for
less money.
Here's a photo of a 2-element Sigma that got killed by ice.
http://www.n5ot.com/sigma80.jpg
The manufacturer said the element truss cabling was not done properly which
I guess means the manufacturer thinks it would have withstood the storm if
it had been done properly. Or something.
73 - Mark, N5OT
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