A double walled configuration of {HEAD ~ the sleeve} can be provided in the sections incorporating the transmitter and {TAIL ~ the receiver} 
A double walled configuration of { HEAD ~ the sleeve } can be provided in the sections incorporating the transmitter and { TAIL ~ the receiver }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL