Object over south Kansas City, MO. Lights on bottom, flying low.

I was about 10-11 years old playing in the front yard with some friends.  I don't rememebr how my attention was drawn to the sky, probably by someone else.  
I looked up and observed a low flying craft approx. 1000-2000 feet up.  It was large but I only vaguely remember the outline being circular or oval in shape.  What drew my attention was a circular formation of lights underneath alternating colors.  
I do not recall any other lights on the object.  Our house was just 5 miles north of Richards-Gebauer Airbase so seeing aircraft was common all times of day and night. This would have been about the time that the base was slated for closing but the military traffic continued well past from when I moved from the neighborhood several years later.  
The object was moving roughly from the northwest to the south east.  I rememebr someone saying "Looks like the UFOs are landing."  I totally freaked and went inside the house.  
That was the last I saw and I never talked about it over the years.  I had convinced my self that it was something normal, possibly a blimp. 
Just recently I contacted my brother and asked him if he remembered the event and asked about the detatils just so I coudl verify that I had not missed soemthing after I went inside.  He related that he did remember, he would have been about 12-14 at the time.  He remembered the object as silvery with lights on the bottom but no other lights.  
It was low and he and other(s) (Unknown who the other kids were) went in the backyard as it went over the house.  
He remembers the object turning to the North and he watched it until it was out of sight.  He distinctly remembers thinking that the object definitely was not an aircraft. 
 pointed out the possibility of a blimp and we both agreed that that we had never seen a blimp in the area before (Especially due to the presence of the airbase) and we were very familiar with the aircraft that frequented the base since we alsways tried to identify the aircraft by the sound they made as they approached for a landing. This object made no sound at all.
Witness indicates that the date of the event is approximate.  PD