David,
I have a stack of two C-51XR + one C-31XR. I feed each band separately on
each antenna, for a total of 11 feedlines down the tower for these three
booms. The performance kicks butt. Follow the directions in the manual to
relocate a single driven element (either 15 or 20, don't remember off top of
my head) to the alternate mounting bracket that is already installed on the
boom. The manual also describes leaving the short tips out of the driven
element. The matching coil will also have to be adjusted on 15 and 20 as
well.
All the data that I have is found at www.w5wz.com
--Scott, W5WZ
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