At approx. 8:15pm, my husband called in to me to come outside and take a look at a weird white wavering light that was traveling across the sky from the southwest to northeast. This object had to have been at a very high altitude, because we heard nothing. We live just outside of downtown Milwaukee and only a few miles from Mitchell international airport. We hear and see aircraft several times as day; this was like nothing we've seen before. We never would have looked twice if it hadn’t been for the very obvious "wavering" from side to side that this object was doing. It is very clear tonight and there were several planes in the area, all with the typical blinking lights, and all at different altitudes at the time we witnessed this. This object had no blinking lights, which is what attracted my husband to it in the first place. We both watched it travel at a pretty good rate of speed across the sky, and then disappear into the tree line.