As for the cat deterrent ... most of my neighbours own cats, and others even feed stray cat's, I've looked for little (green, maybe even black ore other colored) boxes and could't find any ... so I think the only cat deterrent in this neighberhood are my own 2 Galgo's Espagnol (Spanish Greyhounds)
As for tinnites ... I'll quote from my post on the first page
I even thought i had tinnitus ... I went to the Hospital to check it out ... but I don't 'hear' it constantly, and I hear/feel it in my neck ... The doctor couldn't help me ... in finding the cause ... he assured me, it was no tinnitus
Believe me ... there where times I'd rather wish it was tinnitus ... only because then I had a rational explanation ... Instead of thinking, I might be a loony
About "the Hum" ... it (the high pitch sound) doesn't sound like a diesel engine idling some distance away, or the drone of a distant propeller driven aircraft which never comes nearer or goes away.
Altough ... I do hear something like the Hum sometimes, mostly in my bedroom ... indeed seems like comming from the wall (behind, and next to our bed) ... when I almost touch the wall ... I can even feel it, tingeling on my fingertops ... my friend said it wasn't possible ... so I let him measure it (on the central heating unit hanging on that wall) ... and he measured some volts, a very small amount, but no amp ... it even sting a little when I touched the other end of the meter ... he was amazed, that I could hear/feel that ... So he tested it, while he was holding the other end, then there where even less volts, he dind't feel a sting
So believe me when I say I'm not that gullible ... and I first check all reasonable/logic explanations ... but I also think that this search for a logical explanation keeps mee from, experiencing my full potential ...