Hi @RV1966,
Welcome to the Roku Community!
We understand you are having trouble with your antenna channels, which disappeared after turning the TV off or going to Live TV. No worries; we're here to sort this out for you.
May we know if you are selecting the "LiveTV" tile on the Home Screen located with the apps/channels or the "LiveTV" menu item from the Home Screen Menu on the left side?
Note: If you select LiveTV from the left-side menu, you will not get your Antenna/over-the-air/locals. You need to select the tile to see and receive them.
Please keep us posted on how this works for you, and we'll continue assisting you from there.
Thanks,
Chel
Jecheal R.
Roku Community Moderator