Thanks for all these posts.
Learned and realized a lot but before I get to that let me say that I _was_ missing something when I sent the post that started this thread. With the way I originally connected the Mag, as recommended on...
Until July 2010 my enhanced basic cable service from Comcast delivered about 120 channels with no box. Coax into (analog) DVD recorder, then out to TV.
Starting in July 2010 the cable channels above number 31 could not be received...