I have a Hyundai Coupe with a fixed black (non-electric) aerial. I now find that as I drive along the aerial unscrews itself. Presumably the corkscrewing wire around the aerial is providing sufficient lift aerodynamically. Initially it just did this over the summer, but now it does it all the time, except when very cold. Has anyone else experienced this? Any simple remedies? Currently I just tighten it up every time I park. Thanks. Richard