What is the db range between Green, Yellow, and Red Signal Strength? June 03, 2015 14:03 Answer Green = 0db to -50dbYellow = -50db to -80dbRed = -80db or lower Note: We always want to see signal strength in the green, but these numbers can be used to help you judge which end of the spectrum you are on. Applies To Wi-Q and QEL Wireless Additional Information