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Wow, I couldn't even build a 2 band Moxon, but Ferdy has built a 5 band version. He told me that he had to tweak the elements a lot to get acceptable SWR's on all the bands. 20 and 17 are especially tough, because they are so close in frequency.
More info on his great QRZ page: https://www.qrz.com/db/HB9DSP
Thanks Ferdy!