Not sure if I can help or not but here is how mine works. We use it alot camping off the power grid.
My OTA ANTENNA is a BATWING with a built-in preamp and is controlled by this ANTENNA WALL PLATE PANEL
All I do is push the BLACK BUTTON on this panel which lights up the LED. This is indicating to me that 12VDC is now being applied to the built-in PREAMP in my BATWING OTA antenna.
The next thing I do is point the BATWING OTA antenna toward the town that is transmitting the HDTV digital signals.
Then I go to the MENU of my 22-inch VIZIO HDTV TV and select ANTENNA from the menu. Then I select AUTO SCAN from the menu and the TV starts scanning ANALOG signals first then starts on the DIGITAL SIGNALS. If I don't see any DIGITAL signal not counting in the first 15% of the digital scan I will stop scanning and move the BATWING antenna a few degrees in one direction or the other. Then RESTART the scanning again.
We normally get 6-36 digital TV signals scanned in just about anywhere we go here on the East side of the US. All of these digital HDTV signal are full blown high def full screen HDTV signals.
This is what we do when using the OTA BATWING antenna to pick up the digital Natl Broadcast signals from the local towns (CBS-ABC-NBC-FOX-PBS)...
I guess the PRE-AMP in the OTA BATWING Antenna can go bad...
This is my setup at any rate - yours may be different...
Just my thoughts
Roy Ken