After a rainfall I will open the child seat anchor cover to find about two tablespoons worth of water and some wet upholstery directly below the anchor. I have read through, literally, all the other threads regarding water leakage into the Fit and even sealed the cracks that tend to form near the top corners of the rear door opening, yet I still have water.

Is it possible that water is coming in via the antenna opening? I did a thorough inspection of the area and found nothing unusual. Has anyone else run into a similar problem even after sealing the cracks? Any help would be much appreciated, thanks!

 

Its possible and in fact that's what I was about to suggest checking first for leaks. I've seen water enter in under the rubber material that the antennae base sits on top of on a CR-V before.
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I'd either peak through the center seat belt holster or lower the head liner enough so you can peak at the antennae base and have someone carefully pour water around it.

 

I had this issue in my 08. Whenever I washed my car or drove in heavy rain I could see the water dropping through there into my cargo cover. It is the antenna you have to remove the headliner to get to it or at least the back part. I just pulled the whole headliner out cause I was gonna get it redone and I wanted to make sure I fixed the leak.