Good grief!
Do you remember back in the thread where you were first looking at this dish?
You showed a picture of another pole which was missing the dish, but still had the mount.
Let me offer the same suggestion again:
- get that pole (with cement)
- remove and save the mount
- dig a hole for pole and existing concrete
- pour in just enough new cement to fill out the hole
- mount dish, and call it a day.
The above is of course conditional that you can get the other pole (with cement), the pole is long enough, the pole is large enough, etc...
But, I just thought you should reconsider that idea before digging
three holes and going to all the trouble you described.