I just went to the local Advance Auto Parts and found some "Billet" antenna. It says billet but I doubt it's a real billet. Anyway for only $11 so I gave it a try. It comes with two female adapter, just chose the one that fit and screw on. Reception is good.
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Titan/Armada Part Numbers
AEM intake, Banks exhaust, Up Rev tuned. Detroit Truetrac
305.5 WHP, 370.4 ft/lbs tq