Lite On 5005A TV Tuner woes

I just got my 2nd unit – LVW-5005A. The first I returned to Lite On because the image from the TV tuner was grainy. So, they replaced it. A new one just came.

This, too , is grainy. It is only the RF input – the other inputs work terrific. Also, the sound is very mono-sounding.

Is this common? Do other users of this product have the same issue?