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Apologies in advance if I'm posting this to the wrong group but I got bored and made an antenna topper for my my R56. I designed it in OpenSCAD (a free CAD tool) and had it 3D printed in white nylon which contrasts nicely with the black antenna. When I'm looking across the tops of cars in a parking garage, this really stands out. I put it up on Shapeways in case anyone else wants one (just go to shapeways.com and search for "antenna topper").