I have a Nokia Freeview box (I can't remember the model) and it shows a very digitized picture on nearly all channels. I am aware that compression is used to squeeze as many channels in as possible and that some use more compression than others and therefore look worse than others, but is there a way I can improve things? A better freeview box? Better leads? Different output signal type? Change to Sky? I have also noticed an intermittent but regular high pitched bleep on the audio of freeview. What could that be?