Is there any head-mounted mike that has its wireless transmitter right up there on the head -- so that it does not require a wire running down to a belt-mounted battery-pack or transmitter? We've been getting great results from the Samson AL1/AM1 combination, but need an unobtrusive head-mounted unit now -- also has to be almost invisible...preferably just a little clear tube extending only partway toward the mouth... Does it exist?