cloaked craft over IllinoisSitting in back yard facing north. Noticed something moving in north northeast sky at approximately 30 degrees above the horizon. Craft did not have any flashing lights. Perimeter of craft was luminous/glowing outlining shape of craft. Which looked a little like and airplane with tightly swept back wings. The inner portion of craft was clear like it could have been cloaked you could see clouds through it with only the perimeter lite up. It was traveling south very fast. Watched it until it went behind some trees and disappeared. Never came out from behind the trees. Craft did not make any noise. Could not tell the altitude or distance I was from the craft.((NUFORC Note: Witness indicates that the date of the sighting is approximate. PD))