Most importantly, document each and every contact that you make with the utility. Names, dates, times, etc.
Since your hearing it on 6 meters, it is relatively close. Try to see if you can locate the source yourself. The more you can help, the better. Are other hams nearby being affected? If so, have them call the utility as well.
Document, document and document. Also, be very polite. If they blow you off, call the RFI help desk at the ARRL, they'll help you out.
http://www.arrl.org/track-and-solve-electrical-interference
http://www.arrl.org/power-line-noise-faq
BTW, that does sound like 60 cycle interference for sure. Do you have the noise constantly? Does it go away when it rains?
Take more videos and document time of day with weather conditions. Use a video hosting site and email video links to the utility.
I dealt with AEP for over 3 years. I had multiple sources from ageing infrastructure and an industrial complex nearby. They spent major $$$ fixing me up. AEP's RFI guy is a HAM and is now a damn good friend of mine.
Some utilities, can be obtuse and blow you off, just be persistent.
Most people automatically assume it's a bad transformer. They rarely cause RFI, since most will detonate if they have internal arcing. Most times, it's just loose hardware or corroded parts. Slack spans are a big culprit, loose ground staples, leaky insulator or loose wire ties.