It applies to AC. However, RF is more complicated. The difference between "RF" and "AC" is a matter of what materials and frequencies are involved and how you

It applies to AC. However, RF is more complicated. The difference between "RF" and "AC" is a matter of what materials and frequencies are involved and how you are using them. Terrestrial RF systems rely on the Earth as a ground conductor. It becomes more complicated because the impedance (like an AC version of resistance <waves hands>) of a material (such as your body between the antenna and ground) will change depending on frequency. Once a circuit it in place, the impedance mismatch between your finger and the thing it is touching will cause energy to build up at that interface. This is similar to how light diffracts when it moves from one material to another and you can see the boundary because some energy builds up there and is scattered. You won't get a burn if there is no circuit. ...but if you are fully enclosed in an RF field, you may get little circuits forming because your body is in contact with that field, and therefore referenced to it, and the potential of the field might vary across your body.