Guys,
I could use some advice. Late last fall, I erected 40' of Rohn 25G with a
Tilt-over base. It sits on top of a ledge that only has about 2-3 feet of
rocky topsoil. When I dug the hole for the foundation, I excavated all the
loose fill and I core-drilled the rock below about 36". I then epoxied
4-pieces of rebar in the holes, and poured about 3-1/2 yards of concrete
with anchor bolts for the base plate. Unfortunately, I didn't think to bond
any of the rebar or anchor bolts.
Right now, the only grounding the tower has is a connection to a 2-ga ground
wire that runs 120' underground with the conduit that feeds the power. It's
in-turn mechanically connected to a 2-4' ground rod (the max I could
install) every 15'. The 2-ga wire is also connected to the Single-Point
Ground where the coax enters the home.
Since lightning season is about to get started, I'm concerned that this is
insufficient grounding.
I was considering bonding some 2-4" copper strap to each of the tower legs
and running it along the ground for 50' or so. Also, I do have a SteppIR
BigIR vertical about 20-feet away that has an extensive ground plane, albeit
with insulated 12-14-ga wires. This could be bonded as well, but currently
isn't.
What would you guys recommend I do to augment the existing ground?
73,
Dave
K1DLM
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