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Too much math for me,  lol!


You got the general idea. The good thing is that with 3 ft or so excess slipped in each section, you can adjust each one for height and stability and the only penalty is extra drill holes.


3 sections will be all you need. It's best to go largest on bottom to the smallest diameter on top.  You need 1 in or 1 1/4 on top for U bolts to mount antenna.