Given the junctions between sections of the AB-577, I would not extend
the mast above the top support point (bracket or buys) with any antenna
load more than a small (VHF yagi or vertical). AB-577 and AB-621 are
designed to be guyed at the top and several points along the exposed
length. They are not like an MA-40/MA-550 which are self supporting
with the correct base.
73,
... Joe, W4TV
On 8/15/2013 5:30 PM, Ed G wrote:
Hi Folks,
I am helping design an antenna installation for a semi-restricted
community (they allow antennas that extend no more than 10 ft above the
roofline). I believe something like the US Tower MA-40 small crankup mast
with a small yagi would be allowed. But instead of the MA-40 mast, I'm
wondering if I could use an AB-621 or an AB-577, with a concrete base
similar to what I'd use for the MA-40, and a house bracket (again - similar
to what I'd typically use on the MA-40). The antenna would be something
like a KT34M2, which is 40 pounds with a 4.5 sq ft windload. The mast would
be extended about 40 feet, and a house bracket designed to fix the mast to
the house at about the 20 ft level.
Has anyone tried this application for the 621 or the 577? With the
proper size base and house bracket, and small yagi, I am not proposing any
guy wires. Thoughts?
--Ed, N3CW--
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