Well - redid my Kodi install again and... made it a bit further. Hoping this intel might help the next guy.
Just a reminder I am doing OTA channels in Chattanooga, TN.
Okay using the steps discussed above I got to where I could see my HDHomerun on
http://YOUR_HTPC_IP:9981
The next step is: Configuration/DVBInputs/Networks Add ATSC Network
I set network name to "ATSC Center Freqs"
Predfined Muxes - drop down to "United States: us-ATSC-center-frequencies-8VSB"
Create.
Then go to Configuration/DVB Inputs/TV Adapters
HDHomeRun ATSC : ATSC #0
Click Enable.
Networks - set to your newly created "ATSC Center Freqs".
Click Save.
Then go back to Configuration/DVBInputs/Networks
Highlight your network "ATSC Center Freqs"
Then click on Force Scan
This will take a while as it will hunt for all of the Muxes or services or... whatever they are properly called.
Once complete go to Configuration/DVBInputs/Services
That list is all the services your antenna receives.
You can click on Play (I did Shift click so it opens a new window...) Boom - it WORKS!!!
Highlight each service you want to add to your lineup and click Map.
At this point - Kodi sees the channel and a new tab called TV shows up and works.
Still working on the EPG or recordings etc.
But thanks for the hints. Appreciate more hints and maybe this will help the next guy!