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If you have a cable system that doesn't require a box or if for some reason you can actually receive a decent number of channels at good quality over the air, then you can certainly view something other than what the DVR is viewing, but in my experience, such setups have always been uncommon and are only getting rarer.

We watch exactly one channel with any regularity which requires digital: the one Daria is on

My TiVo is set up to record from cable, and has a second input configured to feed only the digital range, via the cable box, on the SVideo port. Yucky, but it means I can use the digital cable receiver for other things if the TiVo isn't.