I currently have a 722 running in TV1 and TV2 mode. The TV2 coax feeds my kids' TVs. If I connect a Sling Adapter to the setup, does that become my only TV2 output? In other words will it disable to current coax output? I was hoping that it would simply stream an HD version of TV2 output over the home network. Calling Dish to ask these questions is a crap shoot. Thanks in advance! Oh yeah, does anyone know where to pick up a Sling Receiver 300?