Your direct e-mail threw me out so I am replying to towertalk....
Mark,
W4NU did the rotating dipole on 80/75. HE started with a Force 12 dipole
with switches for 3525 and 3800. He did not like the results and sold the
Force 12 and got the M2 dipole wihich works great. I think both are 90 feet
long. With the M2 at 105 feet one call is all he needs usually.
Onl;y the guys with full beams beat him.
I use the Cushcraft 2 el 40 with good results. I remember that the ARRL
Books used the almost exact duplicate of the Cushcraft as a 3 el beam back
in about 1980. This makes a 45 foot dipole rather than a 60+ foot dipole.
Would sure save on center mounting and overhead strut. I would imagine
adding a switching circuit would add a lot of difficulty to the dipole.
Instead of trying to build one the M2 dipole would be a good bet although
more expansive than a home brew one.
My 2 el Cushcraft at 86 feet is set for mid band and SWR is only 1.7 at the
low end and 1.4 at the top. Tom N4KG bought one as he said I kept beating
him to DX.
73 Dave K4JRB
SE Division DXAC
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