Mike,
I noticed that you used just a zip code to fix your location. You can explore the benefit of raising your antenna by first fixing your location more accurately. Use the start maps option to begin, and enter as much of your address as you like. The next page will have a Google map with a marker for the receive location. Zoom in on the map as needed and drag the pointer to your house. Notice that reception precdictions will update in the space below. Also notice that there is a place to enter antenna height. Each time you enter a new number there, the predictions will refresh, allowing you to judge the impact of the change.
Of course, this analysis will only tell you how terrain will impact reception.
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