Floating rectangle with 3 lights

Last night, I had a wtf moment, still not sure what to make of it. I have never seen anything I could not identify before. I've been outside day and night my whole life, never seen anything strange. On my way home from Portland around 630pm or so, I was about halfway home and south of Windham a few miles, on a dark two lane road through rolling small hills, no shoulder, forest on each side with sometimes trees hanging over the road. In a break of the trees, out my front windshield at about my 1 o'clock and above the tree tops, I saw a vertical object just floating in the sky (it was not moving) about 1k ft in the air, maybe a little lower. It was hard to tell how far away it was from me but probably less than 1/4 mile. Because it was hard to tell how far away it was it’s hard to tell how big it was but im guessing it was between the size of a Chevy Suburban and a city bus, maybe bigger if it was standing on its end. It was backlit at the top like there was a light behind it and then facing me were 3 lights in a vertical row and I believe they dimmed and brightened in sequence. Because of the light behind it I could see the outline of it so i could tell it was an elongated rectangle. It happened fast, I couldn’t stop and take a photo, by the time it registered in my mind I was under the tree canopy again and a hundred feet or so down the road and I also thought I may see it again but there were too many trees. There are no radio towers out here and it def wasn’t a balloon, a plane, a helicopter or a drone.