I just took down the same dish. It was all 1/2" and 7/16" to take the dish parabola off the ring mount. Most of the bolts will break. That's a good thing - you should buy new stainless nuts, bolts and washers. I cut the pole just below the mount and at the base for a favor to get the pole down for the house owner. Take it home and bath the mount in penetrating oil and take it apart and clean it up, reassemble and you'll be good forever.
I got both my big dishes from nice old ladies who didn't want anything for it. In each case, I just said "hi, I'm me and could I have that old dish? Are you still using it?". They both said "No, you can have it". Simple. No trade of money took place. I showed up with help, got it out of there and left no debris.
My guess is these are our wives in the future. Old man is gone and you can have it.