This is going to sound crazy I know, but please follow up on this. Even if there is an explanation, you are going to be impressed with this. I was watching the Hannity show on Fox (a replay at 9:15 PST from an earlier EST broadcast from 8 or 9pm) and while Hannity was interviewing Ann Coulter, there was a live background behind her in a major city (I did not catch the city and could not rewind to the beginning of the segment). There were several clear instances of regular aircraft passing behind skyscrapers behind Miss Coulter, they were clearly helicopters, but at 18 mins and 30 secs into the hour long program, something flies behind the skyscrapers many times the speed of the conventional aircraft and making several abrupt elevation movements. Please, please, please take a look into this. It may well have an earthly explanation, but I am sincerely telling you that it is worthy of investigation. If it is not a UFO then you will be impressed with it as a textbook optical illusion. Video attached is off of my TV for reference. I apologize for the poor quality.