I was parked in my travel trailer watching a movie when I decided to go outside to use a bathroom. I was facing west when something caught my eye to the south about 100 feet in the air. It was before the moon had appeared on the horizon and the sky was very dark, the stars that night were very bright the time was approximately 6:45 pm (I sent my sister a text message about UFO at 6:49 pm). When I looked up to the south I was looking directly at a metal tower of some sort (radio-telephone) with a red light on top. there was some illumination from a billboard in front of tower. I saw a SILENT shape move very slowly perhaps 25mph (guess) fly over the tower and my head and continue to the north I was only able to see the UFO from roughly 60 yards away to the south and 60 yards away to the north. I could only see a moving blur until the object was directly overhead and the stars in the background were covered up as the shape passed between them and me, it was then I could see the outline of the craft. It appeared to be a diamond shape. If the stars weren't there I would have not been able to see the shape. I would guess its wing span was 25 foot to 50 foot max. I was so excited and in shock it is hard to say for sure on the size. I was very excited and not at all scared like one may think. I was wishing I could have watched it longer. The sighting occurred on Hwy 97 in Oregon just SE of the Diamond Lake Junction turn off. If I was to guess I would say it must have been military or a drone but the fact it was completely silent has me puzzled.