My TV is located in the basement. It is currently hooked-up and wired with DirectTV cable. I plan to stop my cable service to save money and will switch to over the air TV. I plan to set-up an exterior HD tv antenna to get good reception and more tv channels. Can I use the existing cable wires to install an exterior HD tv antenna? If so, how to do it? Or can I just unhook the end of the cable that's attached to the dish and put it on the new antenna?? Would that work?? Please help! Thanks!