On Nov 14, 2007, at 7:56 AM, Norm Klieman wrote:
Hi - Does any one know if a Cushcraft R5 vertical can
be grounded mounted and how high off the ground would
it need to be. I've only used mine in the past mounted
on the roof but at the current QTH I won't be able to
get it up there until the spring. 73's Norm K9NK
I haven't run any analysis, but think that the counterpoise rods
should be isolated above the ground a bit. K7LXC and N0AX did
comparison testing of several verticals and presented the results at
the Dayton Hamvention in 2000 (copies of the report are available
from <http://www.championradio.com/publications.html>.
One of the models they tested was the R8, which is built in a similar
manner to the R5. I recall they had the base mounted about 7 feet
above a ground screen. The results were (in my opinion) better
overall than for the other types they tested. I have a similar Hy-
Gain AV640 mounted on a pipe at 13 feet and am quite satisfied with
the performance of that installation.
73, Bob N7XY
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