I have non-HDTV Directv/Tivo unit (getting locals through it,) an OTA and a TV with a built in HDTV tuner. To get an HDTV signal to my TV, I have to hook the OTA directly to the TV or...can I wire the OTA to the Directv/Tivo unit? Thanks. I read several forums before posting. Some questions/answers were close but not the same, at least that I could find..