Leak on passenger side kick panels...

[Roadkillerv8]

So when i bought the truck it had no leaks, rain wise anyway... I thought the antenna went bad due to almost no radio reception so i decided to pick up one from shucks. didn't really fix my static so it must be something else, but what im worried about now is the water leak that happens when it rains now. Theres a lip where the dash comes down and ive found water pooled there and can see it run down the kick panels. Before i started covering it up, i would find hat the floor was damp enough to make me cringe. does it sound like the antenna could be letting that much water in? there is a gasket there, albeit not a fantastic one, because the antenna doesn't really fit the curvature of the truck. or could it be something like the cowl vents? Any help is appreciated, thank you.