On the old Innova, the external antenna is placed on the rear-left corner of the roof. The cable goes down between the lifter and weather seal of lift gate and to the left tail light. Removing the tail light, there are a bunch of holes through the body shell. The antenna cable is then passed through said hole and goes out the tool compartment inside. From there, it's hidden under the cargo tray, floor mats, ending up behind the dashboard, just besides the driver's right knee. There's a metal frame underneath where the internal antenna (with magnet mount) is attached to.
I only have so much antenna cable length to work with so I can't have it rerouted too far from the old route.
Not my pics, but I've chosen these just so you can visualize it.
1st Gen Innova.... People wonder why outside air is coming into the cabin, this is one of the reasons why. The tail light assy has a rubber seal on it that affords some insulation from outside air. But remember, it's a Swiss Cheese and that's no exaggeration.... there are a bunch of other such holes around the body that lets in unfiltered outside air. The only benefit here is that it makes for an easier cable routing.
Learning on the mistakes from the old Innova, the 2nd Gen Innova has pretty decent cabin sealing.
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