I think it's our geographic locations that determine our strengths. I'm just North of you in Kingsville, and mine peak out at 53. I called tech support once a few years ago and he said it was about what I would get given my zipcode. He said where he lives he's in the 40's and was impressed with what I was getting. Honestly I figured the numbers should be a lot higher just like you were thinking. There was a map on one site I saw that showed how signals were affected depending on where you lived, but unfortunately I don't remember what site that was anymore.