I currently have a swm-8 setup with 3 HR-21s and one HR-20. I am trying to use the swm-8 with my off air antenna and would like the channels to show up on my directv guide. I know the HR20 has the antenna port but do I even need that? I've read a lot of different things on the net and would like to know from someone who has done it. Can I just put the antenna into the swm and it will work on my receiver? If I do have to diplex it right behind the receiver is the HR20 the only HD DVR SWM compatible receiver? I don't want to put it in my tv so that is not an option. Thanks for the help!