I just got a HD DVR from Direct TV and it is going to be here on the 11th. My question is this, I only have one cable from the dish coming into my house. I have a concrete slab and vaulted ceilings, so running another one might be impossible. Is there some kind of box or switch that I can get that will split the signal? Also, if there are some, will they pass the HD signal OK? I think that my dad has some thing like this, but he is only passing SD. Any help would be appreciated.