[TowerTalk] 40 M Rotatable Dipole above Quad

[Craig Sande]

I am installing a 70 foot crank-up tower and would like to install a Lightning Bolt 4-element 5-band quad with a 6 meter add-on.  This should provide nice performance on 20-6.  In addition, I would still love to have a rotatable dipole for 40 meters. 

I've read through the archives and have noted where others have mounted their rotatable dipole on the quad's boom, but then it interacted with 15 M.  Others were considering placement of the rotatable dipole above the quad parallel to the quad's boom, but I didn't see any followup messages about performance.  I would expect the rotatable dipole's performance might decrease due to interaction with the quad's boom.  As long as it wasn't a major compromise, I would lean this direction.  I was going to use a 20 foot mast with the quad mounted at the top of the tower and the rotatable dipole mounted about 14-15 feet above the top of the tower (this would be 5-6 feet above the highest element of the quad).  I'm not sure if this makes sense or not as I don't have much experience with such antennas (yet).

Does anyone have advice for me on a way to keep both a quad beam and a 40 meter rotatable dipole on the same crank-up tower?

Thanks,

Craig