Ok, he seems to be targeting the NVR and cameras. Doesn't seem like anything else has issues. I'm not sure what spectrum would cause issues with the camera system. Sometimes, I turn on the monitor, and the NVR is on a single camera instead of the camera overview screen, other times it is on the playback screen, which requires a password to access.If you have specific devices, it will be easier to help.
I doubt a neighbor will block that big of a spectrum.
Here's another thing, he used to play vehicle shuffle on a regular basis. Meaning he moved several vehicles to different positions on his front lawn. Wonder if they may have something to do with finding the best location for RF. Then the vehicles were put in his back yard and the "coil" of wire appeared leaning against the bottom of his fence perpendicular to our house.
Again, this could be an issue with the NVR, but I would like to have peace of mind knowing if there might be RF being emitted.