This question can only be answered with a guess without inspecting the front end parts for you. It can be as simple as tires not balanced, out of round, or broken belts. You can rotate the tires to the rear and see if the problem moves to the back if so it is the tires. You can also jack the front of the car up and grab tire on top and bottom move in and out towards you and look for loose parts. Then grab tire on front and back side and repeat. Look close at inner and outer tierods and balljoints.