The Ability to delete OTA logos

The logo for Grit TV for the second guide location would not appear. When I re-read your post a second time you mentioned to type Grit TV, the second logo appeared and was selectable.
I had to change the Grit TV logo to the second location guide because the original provided no program guide information. My first post explains what the local broadcaster did with these two channels. Why they moved Grit TV to new sub channel is beyond me.
Original Post

This should fix it

Map your 6.5 to guide from 48.5 WAFFDT5 Grit TV Hunstville zip 35801

  1. Click pencil icon under HDHR
  2. Click plus icon at the top of the window and enter zipcode 35801 and select OTA
  3. Scroll down to 6.5 and click pencil icon at the right (if it's an X click to make it a pencil then click again)
  4. Type WAFFDT5 and select it

All is good now. This should retain as long as I don't delete source correct.

Correct. Eventually when Gracenote updates the guide data for your location it won't matter.
You can check by going to https://tvlistings.zap2it.com and entering your zipcode and choosing Antenna->Local Over the Air Broadcast