vibration in my front end for years, even after 3 alignments between 65-75mph.

NEED more info!! Crash/body work history (even minor) --BENT rims (again-even minor!)--- Suspension history? Tire rotation and effects that has on vibration? (VERY important) SAME shop for all work?? Is the "shop" doing the alignments at your request , or are/was the vibration why they suggested it??? ALIGNMENTs are not typically done for vibration complaints , that usually has no effect. what WOULD have an effect is tire BALANCE and poor quality/wear of tires, and even mildly bent rim(s). what brand(s) of tire(s) are on it and how much weight is on each tire/rim (inner/outer) NEED info to help.