Thanks everyone. Installer left and I now have the HR23. He moved my Tivo 250 DVR up to another room and ran an extra line that was necessary at no charge.
I will contact DirecTV for the AM21. A little frustrating since I discussed this with my rep when I first called for Free Swap.
What was most surprising was that my installer never even heard of the AM21. He looked at me like I was crazy, and even called his superviser. I quickly jumped on-line, posted my message and within 2 minutes I had my first response. I even went on-line to search for the AM21, and countless websites came up showing DirecTV and the AM21 unit.
I was able to show him what I was talking about, and he still had no clue. I quess what I'm saying is that this site proved very helpful for a novice like me to explain to the guy what I was talking about on the fly.
Thanks.