I have today installed about 30-40m of coaxial to a tv in my garage and plugged it into my sky hd box using a sky tv link. Everything works fine sound, and changing channels except the picture is showing sigs interference e.g. snowy and lines. I have chnged the rf channel to 69 no difference. Then by accident I held the tv link box and cable in my hand and hey presto the interference disappeared. Does anyone have any suggestions is it a faulty tv link, can i use soem sort of insulating tape to mimic my hand? All suggestions gratefully received.