Since purchasing a larger set I am noticing more blurry pictures sometimes with silvery shadows and inadequate details - this is both through sky digital or alternatively through a Sony digital freeview receiver. (I never see the picture break up/blocking) My question is this. Can the picture be improved on either of these methods of receiving - by for example resiting the dish? I have just been told by the aerial engineer who installed the digital aerial for the freeview that this is not possible. This sounds odd to me?