I have an amplified roof top antenna. I am near Tucson, Az now....But I don't think there is any digital stations out of Tucson. Maybe that is my problem. And I have re-setup the zip codes and re-started the R22 many times. I got this AM21 a couple months ago. And tried endlessly to get it to work. I was in south west NM and when I put in the zip for where I was at(Deming,Nm.) it(DTV) told me that my OTA channels were out of Durrango,Co......???? So I knew that was wrong. So I tried useing the zip from the city I got the OTA channels from(las cruces, Nm). I am thinking that the Am21 didn't work in Deming because there is no digital stations in Las Cruces. And Elpaso, Tx. was just too far away to get a signal to use as my secondary zip. Like I said, I tried everything a couple months ago. But now that I have moved I tried again. I am going to try Phoenix, Az. next. It is about 60 miles away.