Wilsonville,IL 1979 also known at time for its radioactive waste dump in seventies

I have never before, reported this event.What my whole family saw in summer of 1979 is the reason i have since been a sky observer ,and since always believed in ufo's.My main purpose of now reporting this is that,after all these years,i'm kind of hoping that by chance or a little luck,that someonelse in the town of Wilsonville,Il had seen something too, in summer of 1979.What we saw, was unbelievable.My two brothers,sister,and i were in back yard just messing around hanging out,when our step-father came out to get us to come in.As he was walking out in yard ,he just suddenly stopped dead in his tracks and stared up in sky.Of course naturally we looked up too.In the nite sky,to the left side of our yard or west ,a slow moving circle craft with several different colered lites,traveled across our backyard to the right or east.This craft was maybe 100 ft above the ground,as it went across our yard.This craft moved so slow,that we could hear a humming noise coming from it.It went across our yard at like walking speed.We all stood there and watched this craft travel headed to east.Once this craft crossed our yard we lost sight of it preety fast,,but only because of how low it was.the tree lines and houses made us loose sight of it.We wanted to chase it or follow it however,i think my step-father was so freaked out by this.That he insisted we all go in immedietley.Now ironically wilsonville was also well know for having a chemical waste dump in its town.The name of the company or name of dump i still remember.So will anyone else in that town whom lived there in the seventies.I just felt i had to tell this story.Seeing is believing.