@Greg T
Well Greg, I'm glad you took my advice and contacted the FCC when you did.
What you haven't told us was if the FCC contacted you, in anyway about the issue with your complaint, before the RFI problem went away.
It's also possible that your utility company, after doing all the work in your neighborhood to eliminate any possible cause to your noise problem, may have contacted the FCC. After all they should have also contacted the FCC to let them know what they did and found to be the problem, and got the door slammed in their face.
There is a possibility that the FCC paid them a visit after doing an RFI test in your area, it would have taken no time for them to find it.
If you have a job and are not home during the day, the FCC may have paid a visit to your neighbor, with the police and a warrant, to pin point the cause of your problem inside their house.
Maybe you should contact the FCC to find out if they did anything, and if for nothing else but to let them know that the noise has stopped. This way if it starts again, you can contact the FCC again to report it.
Good Luck, and let's all pray that we've heard the end of your noise problem.
May this be a lesson to all others with external noise (RFI) problems to their radio equipment.
73