I would not have gone back for free even the first time. After I complete any
installation I have the customer sign the installation work order and there is a clause that says "I agree that the above job has been completed to my satisfaction". Once they sign this there is
no way they can make you come back to reinstall the dish for free. As for the warranties being cancelled I would tell the customer that you are a satellite
installer and not a roofer or stucco man so how could you know it would void the warranty? Once the customer agrees to a particular location for the dish any problems after are
his responsibility; not yours.
kat