Recon, here is a review from CB Radio Magazine you may find interesting.
http://cbradiomagazine.com/Antenna Reviews/Imax 2000/Imax 2000 Antenna Review.html
Road Squawker, there is some talk about calculator math for the 5/8 wave, including Velocity Factor in the link above.
My Imax was very broad banded while working <> 70' feet of feed line. I recall the BW was so wide when using a CB radio it showed a very low SWR the entire CB bandwidth...like a straight line with no curve. Using my VA1 analyzer the antenna showed more than 4 MHz <1.50:1 SWR. I would think that would put the match >29 MHz and possibly still showing close to 1.50:1 SWR.
Has anybody asked 357 if he measured and recorded the dimensions for one of the Max 2000 he returned?
357, did you ever hear back from Solarcon after they received your returns. They make a promise in their manual to do just that if you included contact information with returns.
IMO, something just isn't jiving here.