On an iPhone 6, where is the antenna located that emits EMF? On the top, bottom, or both?

They are all around the iPhone 6. Go to iFixit and look at their teardown of the iPhone 6 if you want to know exactly where.

The whole device emits emf, including the screen.

If you have some kind of pathological fear of emf, don’t own a cell phone or live in a solar system with a sun.

or fm and tv broadcast signals