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Radio nuts know that a 5/8 wave antenna pulls in the most signal. Modern automotive antennas have the antenna wire wound in spiral fashion around the mast, making a physically shorter antenna function like it was a 5/8 wave antenna. I had an aftermarket 17 inch antenna with tighter windings on my truck for year before it broke, and it performed at least as well as the factory antenna. If memory serves, I believe I got it at O'Reilly's.