I realize that Tivo cannot record HD signal, but my question is this: If you have an HD receiver, can you get Tivo to simply record the SD feed. In other words, can I still watch my HD receiver when I want to watch HD, but record the SD feed with Tivo, all from the same wire from the sttelite. I only have the capability to have one wire from my sattelite (large building, dish on roof, can only have one feed). Is purchasing Tivo an option for me while still using my HD receiver as my primary receiver? Thanks.