two abnormal planes, abnormal markings and totally silent at low height.At a distance it looked like two commercial jet planes or military planes, one following the other closely.as they got closer it appeared they were very low, just above the tree level, maybe a hundred feet above the trees. At this point we realized that there was something strange about them.the only lights they had were green. We were travelling north on hwy 61 at 60 mph. I opened my drivers side window and looked right up at the first one just as out passed over the water of the lake. There was no sound from the object and I could see the shape of it by the glow of the marker lights. It looked like a stealth jet, having rounded edges.both objects continued to fly south east over the lake and disappeared behind us.then it hit me that this was not just two planes!((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))