I have been using your 62xx for a month now, and comparing it with two other antennas I have for 40m. The other antennas are a ground mounted vertical, and a vertically polarised Delta Loop.
The apex of the loop is up 48\', whereas the 62xx is only 35\' high, with the ends 15\' above ground. Despite the lower height, the 62xx equals the loop in performance (bi-directional of course). I use the vertical for it\'s non directional properties.
The 62xx resonates at 7180khz, with good SWR down in the CW portion of the 40m band. I do not know if the aluminium tower, or the other antennas affect it, or even the metal roof of my house, but in any event I am more than impressed.
These measurements were made using the MFJ 267, with dummy load. I also an MFJ 870, along with a couple of your baluns !!
Have a nice day, and thanks for a great product.