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

[Gary Huber]

If you have not made the Rohn 25 purchase yet, I'd recommend Rohn 45 IF 
the antenna or antennas are much larger than a TA-33.  I had a TH-3 on a 
bracketed Rohn 25 which bent in strong winds. I (my insurance) replaced 
the tower with (insurance money was enough to buy) Rohn 45 from nearby 
Hill Radio (WA9GCK). I've had 50 feet of Rohn 45 bracketed to my two 
story house and a TH-7 in the air since 1981 or 82. We've had ice and 
wind including nearby passing, on the ground tornados.

1. It all depends on the wind load (antenna size), but yes (see above 
statement)

2. See http://www.rohnnet.com/rohn-gseries-wall-mounts and then click on 
"/G-Series Wall Mounts/" to download the PDF

3. See http://www.rohnnet.com/bracketed then click on "G-Series 
Bracketed Tower Brochure Download"

I do not receive compensation of any kind from Rohn or their 
distributors. I have no association of any kind with Rohn or their 
distributors except for Glenn Hill who is a member of the same local 
radio club, and being a satisfied customer of Hill Radio and Rohn 
products. I can say that Hill Radio may have some very low prices for 
Rohn products sold to amateur radio operators. Years ago, I bought 
(local) Rohn 45 for the same price as what other are distributors were 
selling Rohn 25. YMMV as that was 35 years ago...

73 ES DX,
Gary - AB9M

On 5/5/2016 11:08 AM, Rob Matherly wrote:
> 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
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