I am planning on upgrading to HD service and live in the Chicago area. I called Dish to see what hardware changes I need. They told me that for the 722 unit I would need three dishes on my roof to get all HD and all local channels, and that I need to connect 4 coax cables to the 722. This seems a little overboard to me. I already have single coax lines to each SD receiver in the house. I realize that I probably need to realign my existing dishes (presently point at 111/119 and 61.5), to have both HD and SD service, but add a third dish? I'm not about to rip up all my walls for HD. Is there an HD receiver offered that only needs one satellite tuner coax connection?