Skipvia, don't be alarmed, I'm not out to get you. This is a radio term:
"All frequencies in the HF spectrum (3–30 MHz) are able to be refracted by the existence of highly charged particles in the ionosphere. This bouncing of a signal off the ionosphere is called skywave propagation or "shooting skip". With the ability to shoot skip, CBers have been able to communicate across thousands of miles, sometimes around the world."