Ok, here are some pics of my above ground mount. Been sitting there for about 4 years now and no movement issues yet. The bottom steel deck is approx 8' X 8' and is an old industrial electrical panel that we took apart. The steel plate that the pole is mounted on is an old Fork lift counter weight and is around 24" X 30" (please excuse the poor cuts on the support pegs as I think I was drinking beer when I cut those and had no more steel). We welded the bolts to the main plate and installed a nut on each bolt. We then drilled the top plate and set it on the bolts and put another nut on top. This allow for adjustment by raising or lowering any corner as needed. I then installed 3 big U-bolts 2/3 of the way up the pole and attacked tie down straps to each of them with one going to each front corner of the main (bottom) plate and one going to the center at the back. These were for two reasons. One, added stability, and two they also allow for a very minor adjustments. If the pole is off plumb by just a hair, one ratchet of a tie down strap will bring it back to perfect. I am considering doing something similar, but it would have to be considerable bigger, I think.