Hi all, I've been forced to make the AM21 plunge, since I had to replace an HR20 with an HR22. It should be here laster this week. This triggered a few questions: 1. How is the AM21 powered? Does it have its own AC plug, or is it powered via the USB connection? (I *think* it connects to the HR22 via the USB, but correct me on that if I'm wrong...) 2. Do I have to stack the AM21 on the HR22, or can I place it elsewhere? I have a vertical space issue where the HR22 is located. If I do place it elsewhere, are there additional (longer) cables I need to purchase? 3. Does the AM21 require line of site with the D* remote in IR mode? Or can I bury the AM21 in a cabinet somewhere? Thanks for your help.