How can I make a repeating wave? What is a good way to make a repeating wave without having to manually select every other face and drag it along an axis? I'm trying to make a very long wave and it would save me a lot of time on this project.
I'm trying to make something similar to the metal part of this image but a lot longer and more curved.
Add a curve object and create the basic shape.

In the geometry section of the curve, give it some extrusion to get the height you want.

Use an array modifier to get as many copies as you need.