Flying saucer outside of Orlando, Florida summer of 1977

I was nine yrs old and on a family vacation outside of Orlando, Fl heading for Disneyworld. It was dark and we were on a highway when my mother asked my father if he saw the thing in the sky. It was definetly a saucer shape. We pulled over by the side of the road. It was hovering next to a big builiding many stories high. It had colored lights on the bottom of it going around the craft. The craft was larger than the circumference of the building. There was a small plane flying around it. The craft made no noise. We had a CB radio in the car and each time it got close to the car the CB radio would get full of static. We watched it for 15 minutes or so and continued to drive. Not sure if we lost sight of it because we drove out of range or because it flew away.