I wondered about the strength of the bolts in the ground too taking into account wind resistance etc. Is one missing too? We had some 12m ones put up but they didn't hinge and the bases look somewhat wider (living in a windy county!). Those only had a pair of 400w SONS.
its true they are set into a small concrete base.
and yes they are 17 meters high.
We would have contacted the installers but there is no record of them.
Here is another pic to show the height of the mast.
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