There are a few things I like about the new antenna compared to my '06, the first of which being the base is properly mounted and doesn't get loose or rotate. It's also nice that you can adjust it's angle. The big thing that bugs me however is that the antenna is not really stiff enough. They made it thinner and made of a heavier metal compared to the old plastic one. This makes it a bit "floppy" while at speed or in wind. The wind tends to make it whip around a bit. At speeds around 80mph with wind it can seem to whip all the way back to the point I'm worried it's going to mar the little painted panel below it. I know it's naughty, but at speeds 90 and 100+ it starts to oscillate rapidly and just becomes a blur and once again seems like it's going to smack that painted panel.
Since the antenna screws off from the base, I was wondering if anyone has replaced it with something aftermarket? I wonder if anything with matching threads will work for it, though I don't really know how to measure the threads. I also don't know if the XM radio uses that antenna or if it has another hidden somewhere.