hi all..i'm a newbie to this site. I ride a 1989 goldwing trike. I live in eastern wash state..bridgeport wash (near grand coulee dam). I'm 70 years old, a widower and retired. the upper Screw-in portion of my radio antenna evidently vibrated loose and fell off. i retraced my route but was unable to find it.. does anyone know where i can purchase just this upper portion rather than buying the spendy whole assembly??