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Has this problem just devoloped, did it work before and it's now broken or have you just obtained this device or installed it into a new car.
your car might have athermic windscreen/heated windscreen. check the details of your car and see what UV protection your car has as often you will not get a signal through your windscreen if you have any special glass.
The solution to this would be an external antenna.
other wise how good are you at soldering. you might have a lose connection on the internal antenna. from all the bumping it does in your windows while driving it could have losened something inside.