what I had before was a white ish box powered by electricity. It was behind the lounge TV. The aerial came in through the wall and was connected to this box. Then another aerial lead was also connected to this box - the other end of which went into the TV. when we connected it all back up to the new TV we had no signal. The green light didn't come on when it was plugged in so have guessed that it faulty. but even when I didn't connect it to the TV nothing else upstairs got a signal.
In an attempt to sort the problem out I went to screw fix and bought this as a replacement
http://www.screwfix.com/p/labgear-sc...pply-12v/80459
the green light on this does come on but we still have no signal on any TV. I can't imagine that this can be a problem with anything in the loft because no one has been in there to mess about / unplug anything. this problem literally happened in the time it took me to disconnect one TV and re connect the new one