Looks to be some kind of commercial 6 footer! When I was back in radio at the last one I worked at we had one similar to that one on our roof that picked up an old Westwood One radio show that we ran on certain nights.
If I remember right the one we had was made by RDSC Satellite but seen them made by other companies that they just stuck their name on. We got ours from Harris Broadcast Communications back when they had dishes in the mid 80’s!
It is very usable though for FTA with a LNB change out I would say. Can you get some bigger pictures of the LNB and the backside of the dish where it mounts?
If that is a “Freebie” I would grab it already!
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