Massive 1/4 km+ sized UFO near Chicago.This is the second time I've seen this exact same phenomena in this area. Two "stars" out of place and moving so perfectly in formation that I get the distinct impression it was a single large object, at least 1/4 kilometer in size.It was about 20 degrees above the horizon and about a grapefruit in size at arm's length. There were not enough stars as a background to see if the object was opaque between the two lights, nor was there enough moonlight or lit clouds to illuminate the side of it facing me. The object/objects was between me and the stars on the Western horizon and was moving N/NE, slowly and steadily at maybe 100mph.I was able to observe it for about 3 minutes before the lights faded. The disappearance was very slow and gradual and could just as well been a changing angle as distance.The differences to the last time I saw it (reported here at ufocenter.com on or around 2002 in Rolling Meadows, IL at about 3:30am)was that this was slightly earlier in the evening and about 10 miles west the first siting. I heard military aircraft immediately after the first siting, but the freezing cold breeze this time eliminated any chance of hearing anything. Lastly, the first time it was a clearer night and my eyes could just barely detect a slight curved edge between the two lights like it was a gigantic saucer ufo with its back end tilted 45 degrees higher than the front as it flew forward.