I've noted down some occurances that you may class as a UFO but in reality they are neither Objects or Unidentified.
My first was during a discussion within a chatroom were someone showed eledged pictures of ufo's that kept appearing over a webcam connection with a Volcano in South America. I relaised what the guy was seeing wasn't a bunch of UFO's that kept changing pattern.
Camera's work on the use of light from the surrounding area, on occasion if a camera is hit by a strong enough light (An intense light) it will actually appear as if it's output or film is blanked, like it has been blinded.
Since this Webcamera was in use on the top of a volcanoe/mountain, it was being controlled from the use of Satellites, and these satellites communicate with it on a frequency that could be percieved as intense if the camera was surrounded by it. It meant that everytime the camera was turned you would see black dots in the sky, where the satellites were communicating with the camera.
Of course this then spans out with the fact that these frequencies can occur and matrix sometimes. It's noted in quantum mechanics that if you have something like raindrops occuring on a puddle, you will notice that if say four all hit at the same time, where the circles that emminate from the impact area of each drop meets makes a Wave peak.
This means that if you have for instance a country with a matrix of RADAR that are both military and civilian there is a possibility that certain areas will have intersections that have a higher value than others. where these intersections occur, it's likely that "UFO's" might be spotted.
It is also known that certain research groups are participating in studies that involve Electromagnetic frequency manipulation, and they would be classed as Civilian black ops. They won't share details with anyone, but they are behind some of the largest corncircle stunts, Poltergeist and UFO's that the civilized world has seen or heard of.
It's also noted that some secret research AREAS have people out flying KITES at night, the reason for these kites is simple. At first people should know that if their is secret research there is bound to be people trying to do some espionage, or spying, one of the methods that can be used is Spy Satellites.
Spy satellites might not be able to pick up normal images during the night, which means they will swap to some other medium, like infrared etc. So to stop the cameras from spotting whats going on down, in or around a facility you would have to think of some method of BLOCKING the frequencies that the spy satellites will be using.
This pretty much means you need a FARADAY CAGE, a method where frequencies are absorbed or redirected. In this case having a bunch of metalic kites strapped together and flying about, they act like a conductor which means the Spy satellites can't see below the kites. And intense lights might be used to try and blind cameras.
As most people will state 99.99% of UFO's can be accounted for.
Some sketchy info can be found at:
http://www.geocities.com/SQID_guy/