Definitions for "Rubber duck"
an inefficient antenna and will not pick up a whole lot of signal at your or any other frequencies
a toy shaped like a duckling that is made of actual rubber or rubber-like
Also known as "Rubber Duckie", a flexible antenna normally found on hand-held tranceivers. Inefficient, but useable, and they don't poke you in the ribs too badly either! (thanks to WD5CTQ).
a Zodiac boat bound onto a wooden paltform with gear in it and a parachute attached
Method of parachuting a Zodiac boat and motor from an airplane. Of course, you have to jump out after it.