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