I have used 20G now for 4 years at 70 ' guyed in two spots with three guys
each. It is bracketed to the house at about 12 ft.
I have a A3S tribander and a two meter 6 el quad on top. It survived
Hurricane Opal at 80+ mph winds and an ice storm here in L.A. (Lower Alabama)
If you are careful and install it right, and now overload it, it should work.
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