Hello - I am new to satellite TV and have a Direct TV install planned for next week. What things should I watch out for during installation? e.g., Is there a best location for the dish install (roof vs yard)? Instead of relying on the installer to make all of the decisions, I'm hoping to have enough information to make specific requests during installation if appropriate. Please help...just want to make sure that the installation is performed in the best possible way. Thanks.