I've had problems getting some of the HD channels since getting my receiver. The installer said that one of my big oak trees is in the way of the signal. I've been able to get CNN, Food Network, HBO, Discovery, Showtime, and a few others intermittently, and my locals in HD consistently. I got the new smart card (my 722 didn't have a card at all before) on Friday, installed it Saturday, and suddenly I can get all the HD channels. The oak still has a fair amount of leaves still on it. I'm wondering if the smart card may have helped my signal. Does anyone know what the new card does?