I am searching for an antenna on Ebay comparable to the one that MP3car's store sells.

I found a few listings when I searched for "onstar antenna" in Ebay and found a listing like this one:
http://cgi.ebay.com/ebaymotors/Chevr...spagenameZWD4V

Will this antenna be able to accommodate WiFi, GPRS (cell phone), and GPS?