BG5BJM Brother M has a complete kit, and you can also make one yourself with a 3D printer. You just need to buy some pull-out antennas and aluminum profiles for the main frame. The 10-12-15 configuration is good.
BG5BJM I misread it. You were asking about a 20-meter, three-unit structure – that would be enormous! I didn't realize 😂.
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