Do you have any Reno channels via your AM21?! If you do, go to MENU > Settings > Sat & Antenna > Antenna Setup > Edit Off-Air Channels. See if 46-1 is listed, but unchecked.
If you do NOT have Reno channels via your AM21, you will want to rerun setup of the AM21 again.
Go to MENU > Settings > Sat & Antenna > Antenna Setup > Reset Settings.
Follow the instructions. Once it's finished. Restart your receiver by going back to MENU > Settings > Reset > Restart Receiver. Follow instructions.
Once it's back to Live TV, go to MENU > Settings > Sat & Antenna > Antenna Setup > Initial Setup. Then enter your zip code when prompted. When you click on your market, it will then ask you if you want to add a Secondary Local Market. Enter a Reno zip code (Google or Mark H can probably help you out with one if you don't know one), and then it will ask you to verify that you want Reno locals. It will then collect Guide data...
Check in the Antenna section for Edit Off-Air Channels. 46-1 should be listed. Uncheck any channels you can't receive, and you should be good to go.