I currently have 2 HR21-700s and a HR10-250. I called DirecTV to ask the cost of adding a HR44 and was told that the HR10-250 would need to be replaced because it is not SWM capable. I thought the SWM16 would allow you to connect to the older equipment. I was told that if I wanted to keep the HR10-250, I would need to install a second dish. I'm sure many in this forum know the real answer.