I have it working on two other HR20's. But I got a new one last week that just won't do it. Once I step through the procedure, remote doesn't work anymore until I switch it back to IR. The on screen display says to attach the RF antenna, but I don't think I've done that with either of the other boxes. And it didn't come with any RF antenna to attach. I was like 4 feet from it and getting no response at all. The new box is a HR20-100.