[TowerTalk] Looking for a Short Rotatable Dipole or...

[Bob K6UJ]

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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