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A couple of things need to be cleared up here, cause words are being thrown around here with out much regard for what they mean.
First, an antenna is not a receiver, and a receiver is not an antenna. A receiver is what actually "tunes" a frequency, rejects the rest of the frequencies, and then usually converts it to some form that is needed, be it audio, video, or data. Receivers are very specific for the frequency used.
An antenna is usually a passice device that enables the receiver to "catch" the signal. In general, and antenna will work to RECIEVE any signal. However, antennas can be optimized for the particular frequency it is trying to catch. Usually the antenna needs to be a wavelength long. For some frequencies, that can be 100 feet or more, for others, it can be just several inches. Most antennas these days though are on the order of 1/4 of a wavelength. The more "tuned" the antenna is for the frequency, the better it will receiver. Transmitting is a different story, but since no one here is really transmitting, we won't get into it.
There are active antennas. These need voltage on the antenna in order to allow it to work. Active antennas are used only for receiving.
Now, if the onstar unit has a passive antenna, and your GPS unit (the GPS unit is actually a receiver) has a connector for a passive antenna, you could either solder on the correct connector to the onstar antenna cable, and it will work fine. THis is so because the GPS unit is the receiver. However, if your Navi device requires a GPS receiver, like our computers requires a USB GPS receiver, which receives and translates the signal for our computers' Navi program, and all the onstar unit is is a passive antenna, it won't work. Likewise, if the onstar GPS antenna is like what our computers use, which means a GPS receiver (not passive antenna) and you are using it with a GPS unit that only needs an antenna, then it won't work.
Now, you seem to have found someone who said it will work. Well, it might, but that depends on all the things I mentioned. His system mnight be different then yours, Forget that the onstar unit has been changed several times over it's lifetime, no one here knows what Navi unit you are using. ARe you using a carputer, or an AVIC or some other device??
Sooo, you can be the guinea pig if you want, I probably would, but I would get more information before I took the plunge.
Michael
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