Witness Account

Moving West to East above the Hills just north of the 134 Freeway in Eagle Rock CA was a craft that resembled an (L letter )?
But lying on its back with the bottom part of the letter facing up? It was the same color as the overcast skies, except with enough grey on it to get its outline. It moved very fast and strangest of all "Made NO Noise "! We live on a hill at the top, so you get a great view of anything above the ground far below!