This is achieved by transmitting {TAIL ~ signals} directly over {HEAD ~ the power line} and capturing the reflected signals on that power line 
This is achieved by transmitting { TAIL ~ signals } directly over { HEAD ~ the power line } and capturing the reflected signals on that power line
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH