When I moved into my new home last October I had a TV aerial expert in to sort out the poor reception on my new Samsung Q90T television. He fitted a new rooftop aerial and fintted some kind of Antiference device which I assumed to be a signal booster, as I have a second TV in the conservatory (he told me it isn't actually a signal booster but I can't think what else it could be). All seemed to be fine, and he told me that my signal was so strong I would probably be able to receive programmes from Norway (joke). My problem is that with the aerial going through my Humax recorder I am getting unpredictable episodes of 'No signal', which last for one or two seconds, but sometimes quite frequently. Sometimes the picture just freezes, while the sound continues. I've had several recordings fail through a failure to track the programme. The mystery is that this was happening on BBC1 HD when the Humax internal meter was showing Strength 100% Quality 100%. I had begun to thought that a fault in the co-ax cable was being affected by the wind, but this happened last night when there wasn't a breath of wind. When I contacted the engineer he suggested trying it with the aerial lead going straight into the TV, but I utterly rely on my Humax to be able to watch commercial channels without having to watch the ads (I'd never watch them otherwise). Any ideas anyone?