When selecting a contractor ask yourself the following questions.
After a contractor is chosen:
Make sure you chose the product that is right for you & that brand & color are noted on contract. Confirm that warranties are stated on contract.
Payment terms should be written out fully with no room for misunderstandings.
Also know that if the contactor is removing a satellite dish, the dish should be placed back in same location, however redirecting the dish for signal is not the contractor's responsibility & should be done only by your dish company.
Be sure and remove any items from walls located in the inside of the home that may fall due to the vibrations.
Most importantly agree to an inspection of the property before the job starts. Make a walk through of the house and note any discoloration on ceilings, which may be due to leakage. Take special care to list the conditions of the landscaping and anything located near roof eaves.