I just ordered an HR24 tonight, and a week ago I called Directv with a billing problem but asked if I needed 1 or 2 BBC's for the HR24. They insisted that I needed none, and I'm sure that I read here that I do need a BBC. I don't have a single wire installation--2 wires running to the HR23 that is being moved and replaced with the HR24. I have no BBC on the HR23, and I understand it is built in. So, do I need a BBC, and do I need one on each feed?