Info: http://www.am1000rangemaster.com/pdf/AM1000.pdf Looks pretty good! Although the AM band is pretty crowded,im not sure how far you would get out!
It looks to be a maximum range of 2 miles with good installation (up high, and a large area ground), it runs on 1/10th of a watt. I don't see a price. Mount it up in a pine tree, 50' high, who knows how far then?
Yes the elevation is what matters! (Position up on a mountain and who knows) More info: http://www.am1000rangemaster.com I saw somewhere on that site it saying $795 i think (Quite high)