04 VOGUE water leaking in over sat nav

I got a leak in the worse place..its comming in somewhere over all the sat nav/tv etc..taken that out..ouch!!! Has anyone any idea on the cure for this..i was wondering if taking out side window passenger side above sat nav etc..and having it all resealed at autoglass would cure it.Got a silly plastic bag type thing from landrover,but that just looks like it houses sat nav unit .And i want to stop leak not re direct somewhere else. Anyone had this problem ???? FED UP WITH SINGING CUZ GOT NO SOUNDS
I think its finally done me amp and sat nav and possibly tv etc £££££'s
Any helpfull advice would be good. [NO TO A BOX OF MATHCES]

I think I heard of a modification that LR fit (water shedder?) that shields the electronics. I know it's only treating the symptom, but at least it keeps all the electronics dry in the event of a leak