Advertisements Just talked to D* retention about the THR22. They said that the AM21 is not supported by the THR22 at this time, and they don't know when it will support it. I had called to confirm my order for the THR22 and the AM21 as I wanted to make sure that the installer came out with both units. I talked to retention about it and he confirmed that the THR22 does not support the AM21 at this time, and the system would not allow him to order the AM21 with my THR22. I canceled my order as I need OTH. So much for D* HD TiVo.