Is there a way to manually set-up or edit channel mappings?

I set up and have been using Plex DVR and Live TV for months with my WinTV-HVR-22XX tuner. I noticed immediately, but never got around to debugging, the fact that my local FOX affiliate did not appear on the channels found when scanning.

I’m connected to basic cable, and all of my other channels come in fine (including the digital ‘sub-stations’ associated with that FOX affiliate; Antenna + Comet). I’ve tested the channel searching on my TV and FOX comes in fine, it also came in fine when I used MediaPortal as my TV server.

Is there a way to perhaps change the sensitivity on the channel scan and/or a way to manually add this channel to the Plex database?