Was sitting in the Carls JR. restaurant on Marconi Avenue in Sacramento, near the corner of Eastern Avenue and Mission Avenue. While talking to my wife I noticed that below tree level in the distance there was a cigar shaped UFO cruising. I saw it cruise between trees and when I had looked to see if it would reappear between other trees it did not reappear. It looked like the fuselage of a large airliner but had no wings or tail and it was flying too low to be an airplane. I estimate that it was about half a mile from my location and it was traveling from east to west. If it was at the distance that I thought it to be at I estimate that it would have been a hundred feet off of the ground. It had no lights and appeared to be a dark gray color on the bottom with a light gray color on the top. I chose to mark that it was cigar shaped because I saw only the side of the object but my conclusions are that it was disk shaped but a thick disk, long, convex on the top and bottom and with flat edges. I am a field invesitgator with MUFON and state that what I have described is as accurate as I can recount. To my knowledge, nobody else in the restaurant observed the object. My wife had her back to the event and it happened quite quickly.