I was on my back deck throwing bread down for the birds to eat and I turned to the S.E. and the object caught my eye, I immediately reached in the door without taking my eyes off of it and grabbed my binoculars and wow...at first I thought it was a Stealth then it moved to where I could see it was triangle shape. The whole underneath lit up then went off and did this a few times. The object would completely disappear and reappear a short distance from where I was looking. I also knocked on our kitchen window without taking my eyes off of the object to get my wife's attention but she was on the phone, now I'm the only one who saw this object and its really bothering me. I'm afraid to mention it to my neighbors... they'll probably think I'm strange and leaning on the fence. I've always been a skeptic with this subject but now I'm a firm believer. I kept watch on the object until it just vanished and so far it hasn't returned as far as I know but now I can't help watching the sky. I forgot to mention that the total time for observing it was a good 5 minutes or so and in that time a lot of thoughts go thru your head and still does. I know it was a heavy triangle shaped machine and hovering, what upsets me is; Am I the only person that witnessed it. And what was it doing here?