I'm not fond of the stock antenna either but, IMO, just plugging it or the hole looks just as bad, if not worse, unless you wrap the roof after plugging the hole.
IMO, the Beat Sonic shark antenna is the best alternative.
A little pricey, but this eBay vendor, not affiliated with him, will take less then his asking price.
He also carries other colors.
http://www.ebay.com/itm/161250729036...witem=&vxp=mtr