OK so i got my stock REC Nav unit in the mail today but it didnt come with an antenna.
My question to you guys is: How is the quality of the cheap GPS antennas i see on ebay for going for $20-$40. compared to an actual MOPAR unit.

http://cgi.ebay.com/NAVIGATION-GPS-A...QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/RB1-R...spagenameZWD1V

Or should i just be safe and cought up the extra $$$ and just get a ginuine antenna?
Any feedback welcomed and thanks in advance.