I actually bought (and installed) a cover for the hole, and it actually looks pretty good (http://www.ebay.com/itm/94-09-FORD-MUSTANG-COBRA-R-CJ-GT-ANTENNA-DELETE-PLATE-/150479413641?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item230945a189)
Thats good to know, my original antenna broke...