External antenna on 2000 grand voyager.

I have a 2000 Grand Voyager SE.
Would like to mount an external antenna on it. There is a opening with a
"stopper" on it on top of the passenger side wing.
However I cannot access the underside of this opening from under the hood.
Has anyone got any pointers on how to go about this?
Is there maybe a workshop manual online?

E.

 

if i'm not mistaken i think you have to remove the pass. side splash
shield/wheel well cover to gain access to the antenna area then feed the
antenna wire to pass. side kick panel beside heater box. antenna connector
should be located behind glovebox.