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Additional height benefits you in two major ways, it allows you to clear obstacles, and increases the distance to the "visible horizon".  How much that will benefit you depends on the natural and man-made structures in your area.


For example, if you are in the valley of a mountain range and the added height of your antenna still does not clear the nearby mountains it won't get you much.  However, if you can raise the antenna above the mountain peaks it can make a world of difference.  You may still have trouble communicating with those in neighboring valleys however, unless they have something like a repeater at the top of a mountain.


There is no easy cut and dry way to determine how well the added height of your antenna will benefit you.  You being in a hilly area the benefit you see will be governed by the new height of the antenna verses the height of the hills/mountains in your area.  The big question is does the antenna clear those hills/mountains or not.



The DB