[Top] [All Lists]

[TowerTalk] Hardware for roof antenna...

To: "Towertalk" <>
Subject: [TowerTalk] Hardware for roof antenna...
From: "David Giuliani" <>
Date: Tue, 4 Nov 2003 00:19:33 -0800
List-post: <>
I'm building a new house and want to prepare it for mounting a roof antenna
"support structure"  to the garage.  I'd love to get any and all advice re
completing framing and roofing, for later tower installation.  

Current antenna plans:  
     80 mph wind zone, never much ice
     40' Rohn 25G tower mounted on peak of roof (at 28' elevation).
        (<-- is this still a good choice despite Rohn being in financial
difficulty?  Alternative manufacturer?)
     10 sf antenna max (e.g. SteppIR, 2 meter beam, 144/440 vertical)
     Hazer system (e.g. Glen Martin)
     1 or 2 guy wire sets at 120 degrees
     lower end of guy wires attached to corner framing of house, 25' from
     radio room immediately below antenna, 1 story down  

Attachment to house
     guy wires: 
          anchors rated at 5,000 #, mounted to roof truss (designed for
attaching climbing equipment) but terminating with a nice "Eye"
               (<-- better idea?)
          lots of metal tie bars holding wood members together and down to
          vertically placed glue lam penetrating through roof peak, bottom
well tied to central bearing post.
          BP25G base plate, bolted to lam (<-- better idea?)

Conduit: 3" PVC with service head (<-- suggestions?)

Grounding:  (<-- haven't finished designing this part yet; ideas?)
          #2 copper stranded wire running through bldg to 10' ground rod
sunk in ground
                clearance between ground rod and concrete floor
          2-4 copper straps running down roof and along outside of bldg to
ground rods, 2 rods per run

Anything else to consider?  

David Giuliani, WA6PXX
Mercer Island, Washington


See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

TowerTalk mailing list
<Prev in Thread] Current Thread [Next in Thread>