My dad has a Delta-C140 from F12. He has been quite happy with it.
73,
Joe kk0sd
Sent from my iPhone
> On Apr 28, 2016, at 12:10 PM, Jim Brown <jim@audiosystemsgroup.com> 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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