I can see traffic at high level from south of the Pyrenees, almost up to the Brest peninsula, and out into Biscay. The antenna and pre-amp (NOT dish!) is a Wimo GP-1090.
I can't see anything lower than about FL70, because a). there are no airfields close by within line-of-sight, and b). because I live in the hills the terrain between me and other airfields means that the signal is lost as the traffic descends. The best "views" I have (because of valleys) are Bergerac and Toulouse, but even here, FL70 seems to be the limit. If you are that close to Toulouse (and not in a deep valley) you should get far better low-level results than me. Buy an external antenna, place it as high as is feasible, you should certainly notice a difference.
DC