Silent slow moving huge dark grey triangular craft with 3 lights in each corner.

Dark grey triangular shaped craft with 3 lights in each corner moved silently and slowly from south to north, just above the trees.  I would guess it to be at least 150-200 feet at it's widest point.
This occurred when I was a child (about 8 or 9 years old) and could have happened in the summer of 1969.  I was camping with my family in Upper Lisle Park but was alone fishing in pond in a somewhat secluded area about 1000 feet south of Upper Lisle Rd. and 300 feet west of Whitney Point Reservoir.
I was facing north at dusk as the craft came directly over me and continued moving north at a speed I would judge at about 5-10 miles an hour.  I watched until the trees to the north of me blocked my view.  I ran back to the campsite thinking everyone there would have seen it and would be talking about it.  However no one was, and afraid of being ridiculed,  I did not tell anyone that day of my experience.  I figured since it flew just above the trees, the trees must have blocked their view.  Plus it made no noise and it was getting dark.
Witness indicates that the date of the sighting is approximate.  PD