I had two tvs hooked up to my HD Dish service. One downstairs (a HD tv) which is directly connected to the receiver and another one upstairs (a regular non-HD tv) which somehow obtains all the same channels through a cable port. At first the set up was perfect, but now I've replaced the upstairs tv with an HD tv. How can I obtain the same HD quality on my upstairs HD tv that I have set up on my other HD tv (which is perfect HD quality) downstairs?