Originally Posted by Resist
The antenna is fine and it's not failed whenever I watch the TV.
Were the shows on different channels? Local stations can and do have outages. If an electronic component fails, they may not have a replacement on hand and have to wait for it to be delivered.
Also, many of the local stations may transmit from one central antenna farm and an issue there could affect every station.
Check your local news for a report of an outage.