My favorite method of installing standard ground poles taht are 1.65" diameter is to use a chain link fence line post. While I prefer concrete mountion of the post in the ground, for apartmemts and other rentals, I usually use a standard green farmer's Tee post. The 16 gauge galvanized chain link line post convniently and securely fits over the Tee post with a very secure friction fit. When driven into the ground with a post driver, the combination is extraordinarily strong and secure.
Currently, I use the same post combination for AT9 and AU9 dishes, with the addition of setting the post in concrete. In case, and if ever I would need to go below a deep frostline, all I would have to do is to make the concrete deeper. Contrary to conventional wisdom, the steel does not need to extend below the frost line.
For the AT9/AUG, I have installed more than 50 using the above combination along with this adapter on eBay;
DirecTV AT9/AU9 KA/KU Adapter for old 1-5/8" pole - (eBay item 150154586970 end time Sep-02-07 20:33:58 PDT)
I bought one and reversed engineered my own. And, it is so simple and works perfectly.