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Bob, just looking at the base of the Vortex Q82 Mark2 in Dave's videos, below, at about 14 seconds I can easily see this off-set dimension could be close to 3" per radial at 27.5 MHz due to the large mounting brackets noted in the image below. Also note how wide the base looks including the radials.


www.youtube.com/watch?v=Uq0ulNbKlWo&t=95s


My current model at 27.5 MHz the has the off-set at 3.5" from the center of the base. If I ever get this model right and it shows the fantastic gain reported...I can only  imagine it will be similar to what I think you suggested earlier, "...that I would have to get the dimensions right in order to see the real results."