What I have been annoyed. With great regularity stations fell like Tele 5 or Sport 1. HD broadcasts of ARD and ZDF were running only with image defects. The solution was quite simple: the signal from the dish was too strong for satellite set-top box (a Humax PDR iCord HD) and therefore caused the error. The attenuator controls down the signal strength, but increases while the signal quality. For little money I now have a fully functioning receiver and enjoy the TV quality. Unfortunately, the attenuator, the quality of TV programs do not increase ... ;-)