My neighbor and I had a falling out several months ago .......
From time-to-time I read a post here where someone asks... let me say... slightly "different" questions. Often things that involve spying on... or listening to a neighbor. Generally I would
somewhat blame X10... as sometime ago X10 ad's gave the impression that the cameras could be used for spying. Often... it would become apparent that the poster was actually committing acts of spying themselves. Spying on people isn't legal anywhere... that I am aware of.
I hate to ask this.... but
is your neighbor a former romantic interest? Because that is when these posts generally start to get weird.
Your neighbor... or ANYONE else could be spying on you! I can't tell from here [at the forum] what is wired up in your crawlspace... and I don't think anyone else can ether. If your being stalked... you need to find out now... not toy with the idea. Feelings are real... even if they aren't always correct... don't discount them.
Get a family member, trusted friend, or friend-of-a-friend to investagate in, under, and around your home tomorrow. This isn't a movie! This is real life and
motors, switches, cameras, and listening devices will show up if they are there. Don't remove them if they are there... call the police.
However... if nothing is there... that won't change your feelings of being watched, nor will you stop hearing motors. You may have to move. You may need medical attention even after you relocate. Of course... the paranoid feelings of being watched can themselves be caused by some prescriptions... or even heavy drinking. A doctor may be able to identify the motor... or humming sound... your hearing as well (if nothing is found around your home).