[Alan Anderson]

I don't have quick access to the field dimensions or I'd give you the answer. But I can tell you how to find it.

You know the width of each of the three driver stations. You know the width of the field. Subtraction (and division by two) gives you the amount of field width taken up by the feeder stations in the corner, which is one side of a right triangle. You know the width of each of the two feeder stations, giving you the length of the hypotenuse. Trigonometry tells you the angle.