I believe, this will be much better if you use this as LNB on your Dish and point to the signal.
Put this one on your Dish, instead of the Cantenna, this is much better.
Replace the Cantenna here with the one at the top picture. I believe, this will have a much better signal.
This will be directly connected to your USB, coz seems the wireless network adapter is the one with it facing the reflector. But the problem, is the rain if you put this outside the house.
It will work with dish, if you could water proof it. Or you can house it with a can, to avoid rain.