Whelp, that is the other thing that came to mind was a security system, albeit the one I have here doesn't seem to affect anything with all its wireless door sensors and motion detectors and spurs don't seem to be radiating on the landline it's attached to. (THERE, just gave out private info to 3rd parties reading since I don't have a Samsung Smart TV where they can listen to me verbally.) They do have security systems that use 800MHz cell phone to call out, and I have no idea if those are spurious. I guess get out that portable and DF, DF, DF, in order to find that MF.