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It'd take more than that, I'm afraid -- the mast on a non-pen mount is perpendicular to the frame, which would make the mast plumb on a flat roof, but nowhere else.
If you installed one of those on a pitched roof, the mast would not be plumb, it'd be off the 90-degree mark by an angle that is equivalent to the pitch of your roof.
So, aside from trying to keep the thing from sliding off the roof (or, for that matter, moving at all), you'd have to do some re-engineering to re-plumb the mast before you could install your dish on it.
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