One thing you can do is call your local power company and find out if they have an RFI (Radio Frequency Interference) division. Usually if there is a problem on your street (or nearby) then it also behooves the power company to fix the issue, since it likely affects the efficient transfer of power down the lines as well. Some of the problems they have are loose insulator hardware, insulator materials that are breaking down, etc. Contact the RFI folks and tell them what you are observing.
Whether your company has an RFI group or not, the best thing you can do is try and locate the pole causing the interference. This is more complicated than I can describe right now in this posting, but the process consists of you walking and/or driving around with a handheld or mobile receiver to narrow odwn the source of the interference. If you can identify the pole then they can usually fix it. It will be especially easy if you see any arcing on the pole.
If the issue is being caused by high tension distribution lines then the fix may be difficult. It has been my experience that it is far more complicated to fix those issues since they frequently have to shut down or transfer power between high voltage distribution lines, which can be complicated. High tension lines are usually not the cause of these types of problems since they are typically much better maintained. But never say never.
Hope this helps. There are some great ham radio articles on this someone around the net. Google your way around.
Dave