Where to buy 15 ft 3.5" OD pole?

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It's an idea, however, the antennas that radio operators use tend not to be large relatively flat surfaces.
The dish may be perforated, but it doesn't matter. I don't remember the exact number, but it's something like any dish made with perforations smaller than about 1" is darn close to equivalent to unperforated sheet metal w.r.t. wind pressure calculations.
Even if it's made out of wire screen and the actual metal surface area is really low.
The perforations save weight, not wind pressure.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.
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This is Turtle.
You need to call the scrape metal places and ask for 2" or 3" Drill stimb used on oil well drilling. They should get a lot of it for they can only use it so many times before the just dump it and buy new. This stuff will not bend or break no matter what you do to it. To get the size right buy you a 3" or 2" to a 3.5" reducer and weld it on the end to fit your 3.5" dish adapter.
I can't believe a scrape metal company don't have 3" Schuale 40 or 80 pipe ! Angle iron and iron pipe is their biggest items they deal with. Maybe it's the 3.5" pipe they don't have but 3" is a common pipe they get.
TURTLE
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