I was told by the sales rep that this converter would work with cable as well as an antenna input. IT DOES NOT. It clearly states on the box and internal instruction material that this unit works ONLY with an ANTENNA input. It's quite a bit of work to hook this unit up. Now I have to take it down and return it. No fun there. Since my cable provider switched from analog to digital more than a year ago, I have judiciously been looking for such a converter for a CABLE INPUT since I have two excellent Pioneer DVRs with analog tuners. Apparently there is a signal in the over the air signal, or perhaps the cable signal, that will distinguish the inputs. Why? I have no idea. It stinks, but they do it.