FM signals are used in a preferred embodiment because they effectively pass from {HEAD ~ the wheel area} to {TAIL ~ the radio} 
to
FM signals are used in a preferred embodiment because they effectively pass from { HEAD ~ the wheel area } to { TAIL ~ the radio }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL