Got an antenna, i think, leaking on an '04 GP. Most times that we get a hard rain, some water will tends to come through between the overhead light when driving the car the next time. The gasket on the base of the antenna seems good.. and i pulled the headliner and tightened the antenna. Could this be caused by something other than the antenna? Or any good solutions? I haven't went as far as caulking the antenna yet...