If you're watching NBC 40 on channel 40.1 over the air via antenna, you will need to rescan your television set on or after March 13th 2020 in order to continue receiving the channel over the air. If you have cable or satellite, the channel you watch will not be affected.
Rescanning is simple and requires no new equipment or services. For more information on how to rescan your TV's tuner, visit FCC.GOV/Rescan or call 1-888-CALL-FCC.
FCC has also released a video giving more information on the rescan and how to rescan your TV's tuner.