Missing guide data on a channel

I’m in the US using a Hauppauge DualHD USB. It scans the OTA channels and find everything that I expect. However, I cannot find a single CBS show on the guide. 19.1(WOIO) shows up on the channel setup but nothing in the guide. Is there a way to see if Gracenote is missing the data or if Plex just isn’t linking the channel correctly?

I’m running latest plexpass on ubuntu using the media-tree kernel for driver support.