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[TowerTalk] guyed tower on a hill

To: "Tower" <>
Subject: [TowerTalk] guyed tower on a hill
From: "Dick Green WC1M" <>
Date: Mon, 8 May 2006 11:56:53 -0400
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I'm planning a 100'-110' Rohn 55G tower that will be located on a hill with
a slope of about 30 percent. The preferred guy placement would have two of
the guys running across the slope uphill and one guy going almost straight
1) The elevation from the tower base to one of the uphill anchors is 8 feet,
which allows me to move the anchor about 6 feet closer to the tower base and
maintain almost the same angle as the guys would have on level ground at the
specified guy radius. In order to minimize the difference from the specified
guy angles, I moved the middle guy to the point where the angle matches
spec. This resulted in the top and bottom guys being within about 1 degree
of the specified angles. I should be able to get similar results on the
other uphill anchor.
Question 1: Is 1-2 degrees a reasonable variation from guy angle specs?
2) The situation with the downhill guy is much more extreme. The difference
in height from the base to the specified guy radius is 26.5 feet. I would
have to move the anchor to about 125 feet from the base in order to match
the specified angle of the middle guy. But this results in a difference of
5-6 degrees on the top and bottom guys. Not only are they off from spec, but
they don't match the angles of the uphill anchors. Near as I can tell, when
there's a big difference in elevation, there isn't any way to make all the
guy angles on a particular anchor match spec or their counterparts on the
other anchors.
Question 2: Is this an acceptable situation?
3) I may be able to rotate the guy placement so that two of the guys run
across the slope downhill and one runs almost uphill. I'll end up with the
same situation, though I'll end up needing less guy wire.
Question 3: Any point in doing this?
I'd like to hear from others who have encountered similar situations.
73, Dick WC1M

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