[chriscjcj]

In nearly all populated areas of the US, you can still receive broadcast TV for free over the air with an antenna.

Digital television stations state what "channel" they are in their signal's meta data. That allows them to change frequencies but keep their channel identity. Since TV when digital, many stations have changed frequencies, some several times. You may find the "repacking" of the broadcast TV frequencies an interesting read:

https://en.wikipedia.org/wiki/2016_United_States_wireless_sp...