form a right handed quadrifilar helix about resilient strips 76 if desired a left handed quadrifilar helix could be formed instead coaxial feeds from feed holes 64i l of boom segment 60c are soldered and bonded to the ends of the respective helical conductive copper strips 78 uhf antenna 38 also includes an 34 s 34 glass peek lenticular stiffener 80 bonded to the interior of uhf antenna 38 one end of lenticular stiffener 80 is attached to the end of boom segment 60c and functions as a bendable hinge lenticular stiffener 80 is attached to boom segment 60c for example by bolting a curved spacer 81 made of ptfe facilitates this attachment by filling the space between the bottom of boom segment 60c and the top of lenticular stiffener 80 thus when antenna assembly 30 is stowed the end of stiffener 80 near boom segment 60c is bent back so that stiffener 80 and antenna 38 are folded against helical structure 40 upon being released for deployment the resilient nature of stiffener 80 causes it to straighten out again so as to axially align stiffener 80 and boom segment 60c a ptfe distributed gravity gradient mass 82 is bonded to lenticular stiffener 80 distributed gravity gradient mass 82 biases the satellite in a desired direction with respect to the earth to facilitate attitude control of the spacecraft gravity gradient mass 82 is distributed along a length of stiffener 80 to be more easily supportable alternatively as shown schematically in fig1 a.