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