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Discussion Starter #1
First off, very cool site, I searched a bit and found similar questions, but not exactly like I want.

I have a 2008 Chevrolet Cobalt Sedan with XM and Onstar.
When the 3 month trial of XM expired I never renewed.
My wife just bought me a portable XM (XMP3 to be exact)
I have the cradle mounted in an air vent and the antenna that came with the car kit is on the hood.
My thing is that there are too many wires on my dash now, and the magnet is making marks on my hood.

I want to find out if I can use the antenna that is already built into the cobalt for the XM I am not using, for my portable XM radio, so I can get the magnetic antenna off my hood before it does more damage.

Onstar is active with full package.
 

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Place aftermarket antenna inside car, such as inside corner of dash, up by windshield or even better, get a piece of the hard velcro and stick to bottom of antenna. Sticks by itself on back shelf. If you have to place outside, get a piece of clear vinyl, such as the material they use as "rockguard" that sticks on to prevent rock damage to your paint. It is sticky on one side. Cut out a small piece the size of antenna. Wont see it and antenna will not hurt paint. When done, vinyl just pulls off.

GTO 1
 

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Discussion Starter #4
I am looking at using the antenna mounted on the roof.
Basically I need to hear from someone who has taken the radio out and actually seen the connector behind the stock radio.
I do not want any more wires hanging from the dash, if I can help it, plus I cant see having an XM antenna mounted on my car and not using it with my portable.
 

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^^^ i switched out head units, and i couldnt find the antenna for the xm. might have been i just didnt look hard enough, but its not marked or anything. let me know if you figure out which one it is so i can tap into it also. right now i have 2 xm antennas on my roof lol
 

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The XM receiver is mounted under the package tray under your rear window. You have to fold down the seats, remove the 2 speed clips and remove the rear headrests to to get at it. The wire for the stock Xm antenna is pretty short. You might be able to go to radio shack and find an extention. But personally if you are going to use a portable xm, i would just go with what GTO 1 recommends.
 

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The XM receiver is mounted under the package tray under your rear window. You have to fold down the seats, remove the 2 speed clips and remove the rear headrests to to get at it. The wire for the stock Xm antenna is pretty short. You might be able to go to radio shack and find an extention. But personally if you are going to use a portable xm, i would just go with what GTO 1 recommends.
So is this how you would use the stock antenna for a new installing a new deck?
 

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So is this how you would use the stock antenna for a new installing a new deck?
When we installed my aftermarket stereo I mounted the new xm receiver under the package tray in the spot where the factory amp would be if I had one. The wire from the stock antenna was long enough to reach it. But if you use the stock antenna you might have to modify the plug on it. We had to cut a notch out of the plastic on the plug to get it to work with the aftermarket receiver.
 
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