This is the evolution of the problem on my Roku TV:
Originally there was a simple Live TV menu item for accessing the OTA channels as well as the stream channels. After a software update sometime in the past year, there was a new purple Live TV menu item. But the original Live TV menu item was still there. After another recent update, the original
Live TV menu item is gone. Only the new purple one is left. The purple one does not allow
access to the OTA channels, even if I disable the stream channels in the Settings as suggested by the Roku representative.