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I'll check also but I tried approaching from underneath hood and opening front passenger door. I didn't see any access to the actual base of antenna. I did see a schematic drawing of the entire antenna assembly which broke it down to every part number online somewhere.
Hey there man. If I'm not mistaken it has to be tightened from underneath i.e. with the hood up. It's still dark outside here but I can look at mine later and see, it should be pretty close if not the same as yours.