I'm planning to assemble a Yagi antenna with a rotating mount on the roof next month, and I'm currently compiling a materials list. My original plan was to use a pole and a flange interface at the top to mount the mount, but after checking the dimensions of the 301 base, I found that it doesn't match the common flange sizes available in the market. The mount vendor also didn't mention providing any brackets or supports.
I'm wondering how others have fixed their antennas.