TV Antenna troubleshooting

I have a 2021 Durango HT 283RLT that I just bought used.  I am unable to find OTA channels on the TV.  I have a good working knowledge of electrical systems and radios as an engineer and ham radio operator, but I need help to see if I am missing something in my troubleshooting.

Antenna is a King Omni
Coax from antenna to King Power Injector tests good (using Klein cable tester)
Green light on injector shows power and measures 12.6 volts
Antenna coax at antenna head on the roof shows 12 volts on multimeter
Scan for digital channels shows NONE

My old travel trailer is parked 10 feet away and with a Winegard Batwing Antenna, I get about 30 channels.

I replaced the original King omni antenna with a new King Omnipro.  Red light on antenna is on showing voltage.
I replaced the King injector.  Green light is on.  
Still no channels in the scan.

I brought in 2 other TVs and connected them directly at the injector output.  Still no channels from a scan.

I removed the injector and antenna from the RV, took them outside, powered with 12 volts and rescanned.  Still no channels.

Hard to believe I have 2 bad antennas and 2 bad injectors.  Does the King Omnipro really have that bad of a gain compared to the Batwing in my adjacent trailer or am I missing something?

Any thoughts would be appreciated.