Ken - Did you have the BATWING with the added dipoles.. The earlier BATWING did not have them and was alot weaker antenna...
Added DIPOLES look like this

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The older BATWING looks like this without the dipoles...

Google Image
We camp off-road alot with out OFF-ROAD POPUP camper and I added a BATWING using an outside easy up antenna mount. We get great reception of the digital HDTV signals from the local towns... AT home in Northern Neck VA we pick the digital HDTV station from both Washington DC and Richmond VA. We are almost in the middle of them being around 50 miles away from the stations. Washington DC has transmitter sites on both sides of DC so we have to move the BATWING antenna to be able to get all of the station there...
We have to scan in the digital HDTV stations everytime we change locations...

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Roy Ken