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
base
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
foundation
base:
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
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