The best antenna I have found that isn't really expensive is the 8 bowtie array. This one does not have a built-in amplifier so you will have to get one of those as well. Super DB8 Multidirectional HDTV Antenna
This one has alot of gain but you have to really point it accurately...
looks like this
My BATWING antenna however does a bang up job. Mine has the added dipoles on it. It is pointing correctly to pick up TV stations to the right of the photo. Looks like this one
I'm assuming you are providing 12VDC to the antenna to operate the built-in Antenna Booster Amplifier. You also have to use your HDTV menu and select ANTENNA and do the scan for signals everytime you setup somewhere...
We camp alot way back in the woods with my OFF-ROAD POPUP setup and gots to have TV for weather channel live radar. Always not a good idea to get caught in high wind...