Prodelin manufacture a 1.8m receive only dish, their advantage over the Channel Master is the polarmount as standard so motorising is easy to achieve.
Why the need for an offset dish? The 2.4m from Prodelin is a prime focus dish but once again it has a polarmount
I agree that in an install of this nature it is best to check with a structural engineer on both wind loading and amount of concrete necessary to hold the thing down. Additionally it is strongly advised to chain all parts to secure them from sliding across the roof in the winter.
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