For the AM21 to pick up 9.3 in your instance, you have to match a secondary zip code that either has a 9.3 channel in it OR a matching .3RF channel. For instance, lets say your 9.3 channel is 9.3 RF25. You look for a any zip that has a 9.3 channel in it. OR a zip that has a .3RF25 channel in it. Any channel number will work as long as it's .3 RF25. Matching that way any channel 3.3 RF25, 23.3 RF25, 64.3 RF25 will work. This gives you the flexability to try and match the guide to your local channel. Lets say your local 9.3 is metv, if you can find a metv on either another 9.3 or a .3RF25 in another zip code the guides will match. I'm in the MPLS/STP market, I use Weslaco TX to get 5.3 METV in my market with a matching guide. I also use Little Rock AR 7.3 RF22 to get 23.3 RF22 in my market, because Little Rock carries GRIT on 7.3 matching my 23.3 local GRIT station. I use Atlanta GA to get 11.3 Justice Network which matches my local 11.3 Justice Network to get the correct guide on that channel. So by using 3 different secondary zips and matching to cities that carry the same channel, I get 5.3,11.3 and 23.3 in MPLS/STP with the correct guides in my AM21. Channels that are not in D* database for MPLS/STP.