I'm about to enter the world of HDTV and would like some antenna advice. I'm approximately 65 miles NW of Phila at an elevation of about 700 feet. I need a UHF/VHF antenna with a rotor and preamp. I plan to mount the antenna on the roof. Any opinions on the Channel Master 3020? Is that more antenna than I need? Any suggestions and advice would be greatly appreciated. Thanks in advance. I will be hooking up to a DISH 6000.