Noticed from one of your other posts that you're receiving stations from the Peoria, IL market. Your PBS station, WTVP, uses 47.1/47.2/47.3 as its virtual channels, but its REAL broadcast channel is 46 (46.1/46.2/46.3) - see http://en.wikipedia.org/wiki/WTVP. On your HR34/AM21 combination (that currently does not see your virtual PBS channel numbers on 47.1/47.2/47.3), and assuming that your antenna is properly oriented, what happens if you manually enter in the REAL channel numbers 46.1/46.2/46.3 with your DirecTV remote? Does the HR34/AM21 then actually detect that real channels are there, and add them to your memorized list of stations? If so, does it add them by their virtual channel numbers (e.g., 47.1/47.2/47.3)? Also wasn't entirely sure whether you had the original AM21's, the newer AM21N's (with the matte finish) or a mixture, among your HR34 and HR24. Some posters have reported differences in how the AM21 and AM21N act on the issues of scanning and manual addition of OTA stations.