Huge object 100'-150'appearing like a chrome coated deflated balloon moved slowly over Fairfield, Iowa

I had finished playing golf add was driving home.  As I was driving up this small hill I noticed a huge oddly shaped object to my left hugging close to the ground and trees.  I thought it and I still think it could have been some kind of balloon used to bonce radar or radio waves off of because of its chrome appearance metallic surface.  I watched it drift over an open field up and over a forested area.    It was 100-150 feet in diameter generally spherical in shape, but deflated in appearance.  I could see sharp angular edges mostly near the bottom of the object.  I drove home and told my dad.  He was not so interested.  Then one of his frieds came over and said.  "Did you see that thing? It was huge" to my dad.  Wanted to get hypnotised to remember better details.  The exact date is unknown.  All I remember about the date was I was 16 years old and it was summer time.  It may have been a balloon.
Date is approximate.  PD