large, well-lit saucer passes only a hundred feet above house

I will never forget my first encounter with an unidentified flying object.  I had been inside my house in a very rural area watching television with my family.  It was after the last show of the night, and I went to my front porch to relieve myself, as many do out in the woods.  As I stepped out of my front door onto the porch, I saw what I can only describe as two car headlights right above the treeline in front of my house, which was about a hundred yards distant.  The trees themselves were about 75 to 100 feet tall, and I estimated the lights were no more than 50 feet above that.
 So I was stunned at the sight, which my mind attributed to their being a car hovering in the sky.  Instantly, I realized that this was impossible as the lights revealed themselves to be on the front of a large craft.  It was moving at about 10 miles an hour, at about the rate of a running person.  I ran in the house, screamed to my family to see the sight, then ran back outside.  The craft was now directly over our house, and I ran out in the yard to stand under it, to the great distress of my mother & father who assumed I'd get beamed up by it or something.
 I looked up into the bottom of the ship, of which the outline I could barely see due to darkness, (but I could make out a vague saucer shape) but the craft had four really bright lights arrayed as points on a cross directly across from each other.  I'd say they were roughly fifty feet away from each other.  The craft appeared to be about a third larger, maybe a saucer with a diameter of 75 to 100 feet.  As per most ufo sightings, I heard hardly any sound as the massive craft passed overhead.  I strained my ears and heard a very faint hum.  As the craft passed over the trees behind my house in the direction of the rising moon, I could make out more of the thickness of the saucer and the general shape.  It appeared to be about thirty feet or so with a blinking blue strobe light on top.
 We were in an intense state of excitement after this occured, and my dad called the police and reported the sighting (with a satisfaction only a life-long science fiction fan could have).  The next day at my high school, I found out that several people I knew had seen the craft as well, and some had even shot at the thing with no effect.  Another friend and her sister had chased the thing in a car only to have it shoot straight upward at a great rate of speed after a lengthy chase.
 That's my tale, I found this site and wanted to record my experience for the ages, I guess...even if it happened over ten years ago.  To the life of me I can't figure out how such a thing could propel itself with no air downdrafts or normal means of propulsion/lift.  If it was a military craft, they are working with some EXTREMELY sophisticated technology these days...if I wouldn't have been outside I'd never have seen it.