You should check with your local channels, and what happened to their broadcasts. It could be equipment failure, or something to do with your TV. Check with your neighbors whether they have any troubles.
When I cut the cable I went to Direct TV NOW and purchased FireTVstick as my device. I love the Direct TVnow package except it did not include CBS. Not wanting to pay an additional monthly charge to watch CBS I decided to get an indoor antenna. After connecting the indoor antenna and running the channel scan I could receive many many channels but still no CBS.I went on line to see the location of the nearest CBS tower and what direction it was in relation to my house. Simply moved the Antenna about eight feet in that direction , ran another scan and CBS came in clear as a bell...Antennas indoors are very sensitive try moving them. Good luck