Hi all I work for a u.k based windscreen company and see this problem all the time, when the screen is bonded to the appiture all is good, then comes the part where you have to re attach the stereo antenna, through doing this you end up breaking the seal on the bond! easiest way to fix it is to pull back the head lining, locate the antenna and then apply a small bead of bond to fill the gaps test with a bucket of water and all should be good!
the other way to locate the antenna is to remove the internal light where you will then see the cable.
i hope this will help
Will
September 2010