How signal stregth, quality and bitrate relate

What is the relationship between the "signal strength", "signal quality" and the pixilation and stuttering he got when trying to record from various Freeview channels onto a personal video recorder (PVR), computer (via a USB Freeview adaptor) and a DVD-R recorder.

86 comments “Chris: Its really a case of whether or not the repositioned aerial has been aligned facing in exactly the same direction and mounting polarity as befo”- jb38