I have done this and have the OnStar antenna connected to my Eclipse navigation unit. The stock connector doesn't fit most navigation units so you will have to change this. What I did is to cut off the stock connector, carefully strip back the coax cable and solder on the connector from the Eclipse supplied antenna. Make sure you handle the connectors and cable gently as they're quite fragile. The performance of the Onstar antenna (as a navigation antenna)is great!
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