Abstract: Extendable/stowable antenna apparatus includes a molded elongated antenna stem with fixed and free ends. The stem is molded with an outer bearing surface, anti-rotation surfaces extending between the fixed and free ends, and a detent surface including a detent stow slot and a detent extend slot. A molded antenna radome includes an elongated opening molded therein with a mating inner bearing surface and anti-rotation surfaces designed to mate with the outer bearing surface and the anti-rotation surfaces of the stem. The opening slidably engages the stem for sliding movements between a stow position and an extended position at the free end. A spring biased detent mechanism in the opening engages the detent stow slot in the stow position and the detent extend slot in the extended position.