The overhead power line effectively has an air dielectric and therefore the speed of signals on {HEAD ~ the line} is close to that of the speed of light in {TAIL ~ air}, 300 m/uS 
The overhead power line effectively has an air dielectric and therefore the speed of signals on { HEAD ~ the line } is close to that of the speed of light in { TAIL ~ air } , 300 m / uS
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH