Eric,
I like Jim's suggestion. For DX this would be a better antenna to
supplement your C3 on the roof for 40 meters because it will give a nice
low angle of radiation. It will knock the socks off a 40M rotatable dipole
unless you can get the dipole up to around a half wavelength (70 feet)
high.
Bob
K6UJ
On 4/28/16 10:09 AM, Jim Brown wrote:
On Wed,4/27/2016 11:31 AM, Eric Rosenberg wrote:
I''m looking for a 40m rotatable dipole (preferably a F12 EF-140S) to
add to the C3-SS on my roof.
Eric,
How about a vertical on your roof with radials? Both could be wire.
The vertical wire could be mounted to a fiberglass mast like this.
http://www.qsl.net/dk9sq/ Or do telescoping Al tubing and guy it at
the top.
The radials don't need to be perfectly at right angles, and you don't
necessarily need four -- three would work pretty well. Mounting it on
the roof greatly reduces ground losses and improves the vertical
radiation pattern. See my modeling study of this that ran in NCJ last
year.
http://k9yc.com/AntennaPlanning.pdf
73, Jim K9YC
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