Personally I've never been impressed with Butternut's quality. But maybe
that's just me.
I would look at things like the CushCraft R7 (or similar model from
HyGain). Or if I really had money to burn, the big tower from HyGain.
If I were to "roll my own", a Disc-Cone made for 40M would be great
(with continuous coverage to 6 meters, all with no radials). The down
side, large : about 40 ft tall and 35 ft across, unless you wanted to walk
under the cone, then it would be 50 ft tall and 40 feet across.

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Ralph Lindberg N7BSN
RV and Camping FAQ http://www.ralphandellen.us/rv
Cry bother and loose the Pooh's of War