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Six elements on a 39 foot boom is a little long. The Maco 6 element is on a 31 foot boom. I hope you are planning on having a boom support truss as a 2 inch boom that long is pretty weak. I would use a three inch boom for anything over 30 feet unless you include vertical as well as lateral trusses. As for dimensions why not download the Maco manual and copy the design?
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