ATI HDTV Wonder freezing

:confused: I have an ATI HDTV Wonder with ATI 9800 pro video card. I’m splitting the antenna signal between the ATI and a Sony SAT HD100 Directv that receives OTA HD. The Sony’s having no problems while the ATI keeps freezing due to low signal. I have a Winegard line amp before the splitter. At first I had an nVidia video card but I heard the ATI didn’t play well with it so I bought the ATI 9800 pro. I use the antenna pointing meters in the Sony to make sure I’ve got signal strength of at least 80 or above. :confused: :Z