The model number of the TV would help us help you.
Digital TVs will not tune in any channels until you run a channel scan. After attaching the antenna set the TV for over the air and run the scan. Should be in the set up menu of the TV. After you do this the TV icon should be available as an input of the TV.
If you want to try for more channels you can reorient the antenna and rerun the scan. On some TVs you can add these channels to the first scan.