Does anyone know an inexpensive way to communicate by radio to another bike or to a passenger? Is it possible to use those 2 way GMRS radios from Radio Shack? How would I monitor inside my helmet ( I usually ride with ear plugs)? In September I went on a 3 day trip with another rider and it was a great trip but would have been better if we could have communicated other than by hand signals and horn. Does anyone have any ideas?