Factory mounted Onstart Antenna used for cell boost antenna??

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Nrgmanager

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I have '01 Tahoe that I would like to install a cell boost (Wilson), but instead of using their magnet antenna, could I use the onstar antenna that is mounted on the drivers side rear side window? Where does the other end of that antenna end up? Since onstar doesn't support '01s anymore, I thought I would use the antenna already installed and not mess with the magnet antenna?? Anyone have any thoughts?? Thanks in advance....
 
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