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