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
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: http://www.mscomputer.com 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.
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