Where do you put a stethoscope to listen to the aortic valve?

over the right sternal border and the second intercostal space(n.b. it seems paradoxical from the anatomy of the heart, where the aortic valve comes out from the left ventrical, but think of it as the aorta come out of the ventricle, it actually crosses over a bit to the right so it can form the arch of aorta