A transceiver within the communication device sweeps through {HEAD ~ a frequency range} of interest in order to receive signals within {TAIL ~ the frequency range} 
A transceiver within the communication device sweeps through { HEAD ~ a frequency range } of interest in order to receive signals within { TAIL ~ the frequency range }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL