Sighting at work

On Saturday, September 27th, 2008 at about 0115 I was outside having a cigarette and talking on the phone on my break from work.  I work at KEVN in Rapid City, SD so there really isn't alot of activity out here, which made this even weirder.  While I was standing outside, I saw a ball of light in the distance.  At first, I didn't really give it much thought because the airport and the Air Force base are both very close.  The ball was just casually sitting there as if it was a helicopter, but then it started to move.  Then it moved towards me and two light beams came down from the bottomside of the ball.  It took about 10 seconds to travel from where it was hovering to right over me when it suddenly stopped.  My cell phone died for no reason.  I started to get a little freaked out at that point and walked over to the door to go inside.  As soon as I got inside, I noticed that my phone was working again.  When I got off at 0215 the ball was no longer there.