Well, take a survey of the house, use a good compass, point it to where the dish should be pointed and check to see any place on the property that has a clear view of the sky based on what elevation the dish should be.
Usually it is better to mount on the roof as a last resort.
Sorry I don't know any Chicago
installers but you CAN do it yourself if you are willing to spend some long hours. Just remember
Sadoun has really good instructions and if you are confused somewhere we are here to help.