For the past week or so, I was convinced I was going insane. I normally go running with my mate who is abit older than me. Whenever we came to a certain bit of the route, I would complain that there was a high pitch shriek. My friend couldn't hear a thing.
I knew there must be an explanaition. So I went up to the place where I had heard the noise with my dogs. As I was looking around the guy who is the gardener came across to me and asked what I was up to ( it is a big posh country mansion type place with a forrest where I go running). I said that I had heard a noise and by my dogs reaction it was obvious he had as well. The gardener told me it was a shriek box to deter yobs and wild aninimals from hanging around on the land. However he said I shouldn't be able to hear it as I am an adult.
http://www.compoundsecurity.co.uk/deterrent_news.htmlI am proud of my youthful ears and hearing

I had seen something similar before on the news, but with music instead.
http://news.bbc.co.uk/1/hi/magazine/4154711.stmHas anyone else seen/heard one of these things?