The antenna portion that you replace is an AM/FM antenna. The XM one is in the bulge it mounts on top of. In any case, my FM reception seems the same -- which is to say that it works fine. Not sure about AM, as I didn't check it before installing the new antenna and haven't checked it since. I really only listen to XM anyway.
The Vision carbon fiber antenna works great for me.
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2010 Platinum Graphite Roadster - Tour/Sport/6MT/GReddy SE catback/B&M short shift
If the top is up, it must be parked.
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