If you bought a house with a BUD, post some pictures so we can identify it for you.
Measure straight across the dish, and give us the size.
Couple of pictures of the mount would help, too.
Someone here probably has an identical dish and can tell you about it.
If you are interested in getting a BUD, we have a thread to put people in touch with dishes in their area.
We can even tell you what to look for.
Welcome to the forum.