Hi, I've just got one of these and it seems to be working fine - it's picked up the freeview channels and the image is sharp. However, the image does not fill the whole screen - there is black space at the top and the bottom - and the image seems to wobble at the top and bottom edges. It's watchable, but it would be better if the image filled the screen and didn't shimmer at the edges... Haven't had freeview before, so apologies if I'm being thick. The TV is a Sony 14" flatscreen CRT. Any help much appreciated?