{HEAD ~ A transmitting unit} is coupled to the receiving unit and transmits the data to {TAIL ~ an antenna} 
{ HEAD ~ A transmitting unit } is coupled to the receiving unit and transmits the data to { TAIL ~ an antenna }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL