See this post by Dave, from the FAQ section. You can start your research there.http://www.liveatc.net/forums/index.php/topic,1000.0.html
There are few other alternatives, if you still can't decide after reading that, let us know. I have a J-Pole and it's working fine for me. They're rugged and do a great job.
If you are in a hilly area, with lots of obstructions, it makes sense that you can't hear the controllers. If you can get an antenna up above any major obstructions, like large buildings or large hills, you should be able to get the controllers.