I have a 09 FLHT, I just installed a Biketronic/Sony radio Kit. I am wanting to use the factory antenna (I like the StreetGlide look). I known the cable is wrapped up in the L side cover. Do I need to go with HD kit & if so waht are the part #'s. or have people use ones from an auto supply store. & if so what is needed to match antenna to HD cable ?