This ONLY applies if you are running coaxial cable from the box to one or both of your televisions.
If Dish Network has your box to function on channel 60, you would run the antenna scan. If Dish Network has your box to function on channel 73, you would run the channel scan (Cable No Box Scan).
NOTE: For TV 1, in general, the image will be displayed on a lower channel (IE: Channel 3 or 4). You should run an antenna scan.