By studying your lineup further I can see you used Dallas TX 3.3 KPXD and 58.2-58.5 KDTX, Greenville SC 13.3 WLOS, Lansing MI 47.2 WSYM and as I mentioned before Mobile AL 5.3 WKRG, 23.3 WSRE and 58.1 WAWD and Albany NY for 6.2 WRGB. So in all you used 5 secondary zip codes to add 11 channels with your AM21 not possible by using your Rochester, MPLS/STP, La Crosse/Eau Claire zips. And if you study the Dallas TX 3.3 channel, its why Raleigh will work for 48.2. Dallas's KPXD is broadcast on 68.3 RF42, since Mason City's 3.3 KIMT is also broadcast on RF42 the .3 RF42 matches and will be picked up by the AM21. So Raleigh's 50.2 RF49 should be picked up because of the .2 RF49 match to La Crosse's 48.2.