I would always choose 55 instead of 45, but 65G is a whole 'nother smoke in
terms of installation and ancillary hardware.
If you ever do the calculations and determine that you really need 65G, you
probably should have designed to spread those same antennas over two towers
of 55G instead. It will be stronger overall, more flexible, and probably
cheaper, too. You also have the option to rotate 55G, but not 65G without
extremely expensive and time consuming custom fabrication.
Even for those with a "nothing succeeds like excess" philosophy, 65G is
overkill.
73 John N5CQ
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