Seeing Teleguide in Widescreen made me go, "Hmm... what about for smaller cablecos?"
Welp, I thought about it, and on 1/27, I made a concept for a 4:3 version of Teleguide called "Teleguide Jr."
The resolution is 1440x1080 to get the 4:3 aspect ratio older TVs support. To convert this to a NTSC signal, I think an HDMI->NTSC converter could be used or something.
Either way, it's still a concept I had in mind.

Beethoven's 4th trailer (c) Universal Pictures. Listings from Zap2it and are from the Google Fiber Atlanta guide. Concept made: 1/27.