just moved into duplex apt. and getting service transferred this weekend .my question is the existing cable coax assuming RG-6 should i have a new coax run for sat receiver HDTV or just tie into existing cable coax and hope for the best im getting the free install so i know that includes 150ft of cable but will that include a wallfish install that is already existing.thanks for all your help.ps the old cable is approx.10 years old.