Customer in Netherby got in touch because their tv picture was pixelated and breaking up and there was no signal at all on one tv. I used my test meter and confirmed that. On the roof the antenna and masthead booster/ amplifier were working perfectly so that meant the fault was in the ceiling space. Ladder up and through the ceiling access point. When I traced the cable I found someone had not rejoined the antenna able after recent roof works. Once it was rejoined to the system with a couple of connectors and the TVs retuned, everything was working properly.