{HEAD ~ The base station} also has {TAIL ~ an antenna}, and spread spectrum detectors for recovering message data communicated from the remote units 
has
{ HEAD ~ The base station } also has { TAIL ~ an antenna } , and spread spectrum detectors for recovering message data communicated from the remote units
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH