I've viewed all the KA/KU installation videos and it's not clear to me how many RG6 feeds you need from the dish to the home for a typical single receiver system (ex: HR22) HD/DVR installation? I currently have a single LNB std. Direct TV self installation consisting of 100' of underground RG6. Do I need a second underground feed? I assume the second Sat In on the receiver is for DVR. Will I simply sacrifice DVR funtionality if I stick with one feed from dish to home?