Hi Gary,
Having done many 3 element and larger 40m Yagis myself, my opinion is that
the 40-2CD hardware will not be strong enough to be converted to a
"lasting" 3 element 40m Yagi. It can be done, but I fear it won't last.
In your situation I would convert at least one of the 40-2CD's to a W6NL
Moxon (directions at K3LR.com <http://K3LR.com>). It's a really clever
mechanical and electrical antenna design that has excellent gain, fb, and
swr attributes! If your tower is 120ft or higher I would convert both of
them and (topography depending) stack them at 120ft and 75ft (the bottom
one could be fixed on EU or South?.or put it on a swinging side-mount to
cover both).
If your tower is lower then consider rotating the 40m Moxon at the top.
And fixing one of the remaining 40m elements much lower for a strong
signal in the US or south.
73, Scott W3TX
On 11/5/13 5:58 PM, "Gary - N5KDA" <n5kda@bellsouth.net> wrote:
>OK guys, I'm getting ready to get my tower back up and I have two
>Cushcraft 40-2CD antennas. There is no way I will be able to stack them
>but I would like to consider making a three-element antenna by
>lengthening the boom. Has anyone ever done this? If so please tell me
>where I might find the info.
>
>Thanks,
>
>Gary - N5KDA
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