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Have an 07 Ultra which had the whip antennas. Took out my ruler and wire cutters and cut them down to a shorty size. Absolutely no change in reception and didn't cost anything.
We have the shortys on our '09, they work great for our XM radio, and have successfully used the CB also. And its one less thing to worry about when we roll her into the garage, no more catching those tall whip antenna's on the door.