hmm, that could be tougher to get a signal. I live in west jordan and get crystal clear over the air hd, but I'm a little closer to the source.
My advice would be to try an old pair of bunny ears first (if you don't have one, I'm sure one of your neighbors probably does).
You'll need to hook it up to your tv (just like you would any other tv), then you'll have to go into the settings and let the tv scan for channels. You may have to change the direction the uv loop is pointing in (don't mess with the dipoles they won't make a difference.
If that doesn't work you can try buying an HD specific antenna (I have a Terk that I got fram amazon for 30 bucks), but from where you live you might want to go with a roof antenna.
Hope that helps.