I read over the above, and I didn't see anyone make a big point out of the magnetic error for your area.
If you understand and appreciate, and are taking it into consideration, then padon me.
If not, let me point out that south is not south, everywhere across North America.
Start out with the suggested compass reading for your alignment.
By the way, you're not the first to ask about that dish.
Are they showing up surplus or something?
If so, point me at one - I'm your neighbor.