Golf balls for use with a system for finding golf balls and methods for making such golf balls. In the case of one exemplary golf ball, the ball includes a shell, a core material and a tag having a diode which is coupled to an antenna which has at least a portion formed from an elastic conductive material, such as an elastic conductive ink. The core material may include a void for receiving at least part of the diode. Other golf balls are described and methods for making balls are also described.