The value to you depends on how you are going to use it. They are hefty beasts
and can easily support a very large array. Approximately 10% goes in the
ground. So for 40 foot actual height, you need a 44+ foot pole.
The main problem for arrays is rotor mounting and providing a proper thrust
bearing at the top. And of course, there is the climbing issue.
Once it is up, how do you take it (the pole) down? In my opinion, a tower is
better. You can take it with you when you move or sell it if you have to
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