If you enable streaming channels to display in the guide, you'll get the program information for the broadcast channels as well. You'll find that option under Settings/TV Inputs/Live TV/Manage channels in the menu, although the "Live TV" part may be something different if you renamed that input.
Roku broke this at least once before. Somehow, it never occurs to them to test a Roku TV with streaming channels turned off to see if the program guide works.
If you go to a ".1" channel for a minute or so, the TV will pick up the PSIP Event Information Table (program guide) data transmitted by the station itself. That's inconvenient, and in my area some of the major networks aren't on a ".1" channel and don't carry PSIP for the subchannels, so I don't get any program guide for them unless I enable the streaming channels.
