I see most everyone has left out the OPTION SETTING on the TV menu. You have to select ANTENNA verses CABLE when using the OTA Crank Up antenna.
I do another small trick that helps me sometimes... I will select ANTENNA from the TV menu and then goto to the CHANNEL SEARCH feature.
I look at other campers and point my antenna in the same general direction. The new OTA TV signals are now high VHF and UHF frequencies so you really have to be pointing right at the transmitter station or you will not pick anything up.
After the BATWING antenna is pointed towards the local town then I start my CHANNEL search. Mine scans the ANALOG signals first and finding none then it starts searching for the DIGITAL CHANNELS. If it doesnt start counting DIGITAL SIGNALS found within the first 15% of the count I will stop the search and move my antenna slightly one way or the other then start up the scan again. Like others have said we also get 6-36 digital channels most anywhere we camp here on the East side of the US. Might be harder to do on the west since the towns are spread out more... We pick up full high def HDTV signals full screen-great quality National Broadcast HDTV station for CBS-ABC-NBC-FOX-PBS (All free to the PUBLIC). The big advantage for us is these channels also transmit a 24/7 weather radar for the local area you are in and as you probably are aware you need to keep a close watch to the skiies when camping in a POPUP camper. I also have my NOAH WX ALERT radio with me at all times as well. Its not a fun night sleeping in a POPUP trailer with winds getting higher the 40 MPH or so. You need to get to a safe house like the enclosed bath rooms at the site to be safe.
They also sell a DIGITAL TV SIGNAL FINDER called the SHURELOCK. If you hook this inline with the TV CABLE then you can move the BATWING OTA antenna around to zero in on the DIGITAL HDTV signal before you start your HDTV set scanning for digital signals.
The new world of digital TV is the reception is 100% perfect or nothing at all. Not like the old days where you just stick up a antenna and pick up noise or something and then move the antenna to peak up on the analog TV signal. Today it all has to be scanned into the digital HDTV built-in processor to allow you to see the stations - just like you do at Home.
just takes some practice
Just my thoughts