Vic,
My R8 is ground-mounted on 21 foot length of SS40 high yield strength
50,000 PSI steel pipe used for high security fencing. The pipe is buried
three feet deep in concrete. It is guyed at the 17 foot point of the
base pipe with 1/8" wire rope, and between the BC-BD joint of the R8
just below the worm clamp and above the insulator supporting the stub
tubes. The guys to the R8 are 1/8" black UV resistant parachute riser
cord. The R8 has been used for eight years without failure through
several severe storms with 50-60 mile per hour winds and a devastating
"derecho" June 29-30, 2012. My station is located eighteen miles east of
downtown Columbus, Ohio.
I suggest the BC-BD junction as the point for top guying.
John W8UL
On 9/6/2014 6:18 AM, Vic, K2VCO wrote:
I am putting up a Cushcraft R8 antenna on a flat roof that is about 3m
x 3m square. The antenna is sitting on a 1m mast; the antenna itself
is about 9m tall.
It will have four guy ropes to the corners of the roof. What is a good
height at which to attach them to the antenna?
Are there rules of thumb for this?
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