Donanvanatee - In Massachusetts, it is illegal to audio tape anyone without their permission. If you set up an audio system in your yard and happen to pick up their conversation, you can be sued. If you try to use it in court to prove how loud they are, you can be sued. Your neighbors, whether you like it or not, have a reasonable expectation of privacy on their property. The audio tape, unless you want to be sued, is not wise.
Have you checked noise ordinances in your community? Most areas have them. File a civil suit, if you have to, charging them with violating a noise ordinance.
As for your "news videos", there is a whole different set of rules set up for journalists, but even if you are a journalist, you can be sued for invasion of privacy. News organizations have legal teams to make sure they are not violating any privacy laws, but they also have the means to defend themselves in court should someone sue.
Your You Tube video can get you sued, as well, if the woman sobers up enough to view it.
I think, if the police are not responding to your pleas for help, then file suit against these neighbors, have other neighbors testify to the disturbances you are experiencing, get copies of the police reports you have filed, and then spend several years and lots of money and see how it all turns out.
And, if you insist on audio taping, you will probably be put in jail, and that will eliminate all of your problems, because jail will probably be a lot quieter.