This year OTA channel frequencies are changing is many markets.
You can visit TVAnswers to check yours…

By law, many TV stations are moving to new frequencies between now and 2020. If you watch TV for free, using an antenna, you must take action to keep your channels. Any time after a station moves, rescan your TV or converter box to continue to receive your local TV stations. Rescanning is when your TV finds all of the available channels in your area. Because stations must move at different times, you may need to rescan your TV more than once.

I can watch it for free, but have to pay (an internet provider) to watch previously free recordings.

I also had to reposition my antenna after the Dallas repack.