A little trick we have used for years.

Use the standard mast/foot assembly that comes with Dish/DirecTV. Dig your hole and fill with concrete. The foot grabs the crete like mad. The dish does sit down almost on the ground, but we have found very few situations this cannot be worked around. You do have to pay attention for perfect plumb, but the time saved in not sourcing a post is golden.

If you regularly have 24" of snow on the ground, perhaps not the best option, however I think even then it is better than any roof/eve mount. YMMV.

Have fun out there guys.