[TowerTalk] Update on 40' non-guyed tower question

[john at kk9a.com]

I would do what the manufacture says: http://www.rohnnet.com/bracketed

John KK9A


To:	towertalk at contesting.com
Subject:	[TowerTalk] Update on 40' non-guyed tower question
From:	Rob Matherly <jimrob at gmail.com>
Date:	Thu, 5 May 2016 11:08:56 -0500


A couple weeks ago I asked about self-supporting a 40' Rohn 25 tower.
After input from the list and a no-vote from the Missus on guy wires strung
across the yard, I've gone back to my original plan to house bracket it.  I
have a two-story with 10' ceilings, so there's plenty of house to hold it
up.  (There is some concern regarding my metal roof, but less than I'd have
to deal with if I were to anchor a guy wire in a flower bed.)

Question #1 - I've read at various sources that I can go 16' above the
bracket.  Is this correct?  Assuming my rough estimations of the house
height are correct, my top bracket will be at about 30'.  I will also have
a bracket in the 15' area.  I should be safe with about 45' of total height
including my mast f I understand the Rohn data correctly.  Let me know if
this is incorrect, please!  I will also be sistering the studs to help
spread the weight out a bit.

Question #2 - I'm going to homebrew the house brackets since I have the
equipment and know-how to build it correctly (and not some hobbled-together
mess of metal.)  Does anyone here have dimensions and specs on the
materials used?  I believe the angled pieces are 2x2x3/16 galvanized, but I
am not 100% on that.  I do not have any information on the thickness of the
flat steel.

Question #3 - It is my understanding that, since it is bracketed to the
house, the concrete base does not need to be as large - 2x2x3 as opposed to
3x3x3.  Is this correct?  I don't want ground heave to damage my house.

Thanks again, folks!

Rob, w0jrm