I was driving through south-central Louisiana back in March and noticed a few people had dishes mounted on the poles that were used to support electrical wires from the pole on the street to the house, and in some cases, the pole next to a trailer.
If the roof is not an option, and you can not get a solid mounting on the facia, and if there is no basketball goal to mount to, then I could see using a pole securely fastened to the earth as well as secured to the facia/rafters/joist so that it does not sway; and then mount the dish to the pole either above or right below the facia bracket. But only if you needed height for limited available locations.