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