Antennas can be super tricky, but they are also an easy way to get the most out of your TV if you don’t have a cable subscription.
Like paulmohr stated, digital signals which are now broadcast are different than analog signals that were used prior to 2009. If you are using a TV that was manufactured in 2008 or earlier you might need a converter box, and HD antenna for your TV. (The HD antenna catches the signal, and your converter box would change them into analog so your TV can read them.)
I’ve found that you get the most channels when you scan and select “Air.” If you are not happy with those results you can try to scan by “Antenna” too to see that best fits your needs.
What will populate is a red beacon that indicates your home, and color coded chart that will let you know how far away each signal is. You can click on the name of each channel carrier in the color coded chart to see exactly where they are transmitting their signal from.
The TV station will be highlighted in yellow, and will be indicated by a mini tower on the map for you. If you hover over that icon it will tell you mileage of how far that Tower is away from you. The mileage is extremely helpful for picking an antenna that correct for you, as most antennas have a mile recommendation on them to work to best of their abilities.