I shaved mine and I have one of the hidden antenna kits from Autoloc. I don't have it installed yet because I do not have my interior finished yet. I did hook it up before I shaved the antenna and it works just like the factory one for as much as I can tell. You might try ebay to get a cheap one or stylin concepts.
http://www.stylinconcepts.com/parts.aspx/partfamilyid/1546/CategoryID/25/SubcategoryID/286