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Just curious... Is the square box toward the top of my D* antenna a "stacker?"

Another 2nd cable question... I plan to get an HD DVR (probably the HR-250) and DO want 2 cables feeding it. Re the picture below, the square box toward the top presently has 2 lines running from it to 2 Sat receivers located in different parts of my home. They are labeled Ant 1 and Ant 2. The...

I'm considering buying an HR10-250 DVR Tivo for my DirecTV service. I notice that the DVR has two satillite inputs. Is it necessary to run two cables from my antenna in order to record one channel (HD or digital) and view another channel at the same time? If not, why does this receiver have 2...