Planning to upgrade my VHF/UHF antennae for Satellite / EME:

  2M    144-LFA-18-XPOL; Wind load 1.6sqft; Boom length 4.5M (15ft)

  70SM   rebuild Cushcraft Cross yagi; Wind load ~1sqft; Boom length 15ft.

  Yaesu G5500 AZ/EL rotor.

Mast needs to extend 7ft above the top anchor point.

Currently planed to use 3x 4ft military Al mast sections (OD:1.79in, Wall 0.11in).
Made some calculations - with 4sqft wind load it should be good up to 70MPH.

Calculations are made for 6061-T6 one section aluminum tubing.

Unknown to me is the exact specs of those mast sections and there will be one section coupling above the top anchor - possible weak point?

Looking to upgrade the mast to 1.5in Schedule 40 AL tube (1.9 OD x 0.15 wall) 12ft. long or similar with 2in OD max.

AL is preferred, because as a single piece it need to be "inserted" from the top of my roof.

Ideas / suggestions where i can find 12ft Al mast nearby are welcome.

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