RFI from your transmitter.	Part 97 Rules are pretty explicit...if there's any interference...you're on the hook.  So you must resolve any interferance.
RFI from a source other than your transmitter	Be a good neighbor, and help resolve the interferance.  Doing that will go a long way.
Interferance from a non-licensed station	Here is where it gets tricky, but you and your neighbor have options.  Mainly having to get the FCC involved in a non-licensed operation.
You want to build an antenna...but are running into opposition from your neighbors.	The best thing is to talk to, and educate your neighbors.  They will be surprised at how willing you are to work with them.  That even includes installing filters on TVs and Telephones (landlines)
You want to build an antenna, or extend your antenna, but don't know what to do.	Seek guidance from the zoning board, or an ARRL Volunteer Counsel, or Volunteer Consulting Engineers.
The town zoning board is making unreasonable demands/denies based on prejudice.	You have relief under PRB-1.  Once you get into PRB-1 (which is a part of the part 97 rules)
What if the cops are called in?	If the cops are called, do not argue.  Calmly explain to them that they have no authority over RFI.  Also take this time to talk to them, and the neighbors.