My brother needs to temporarily relocate his TV to the bedroom but can't move the sky HD box. A long HDMI cable seems to be the easiest solution. However the distance is about 25m and although cables are available in this length I'm not convinced that the signal will survive over this distance ( he only has a SD subscription). Any idea if this will work, and might he have more success with ethernet cable and adaptors at each end. Alternatively he could extend the satellite cable as he only has one LNB, although this would be a bit harder to make up.