The best time to scan is at night. The YouTube may have a video to help you in this task, your user manual also contains instruction for scanning/programming on-air broadcast TV stations.
If you like to know what broadcast/on-air Digital TV signal you can receive where the antenna will be installed, click on the link above, enter your zip code or address to discover what on-air TV coverage you have in your area. You may have to scroll down the FCC's web page a bit to see the list of the stations in tabular form and clicking on each station shows the direction for your antenna for this station on the map below the table.
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