the antenna that comes with it is a ground plain antenna. made to put on a metal roof. the one i installed is a no ground plain antenna and a 2.5db gain. so you actually put out more then 5 watts. the antenna that came with it is junk. as for mounting the radio i used the same bracket/ bar mount as i did with my front light bar.
this is the antenna i used http://www.theantennafarm.com/catalo...502n-3230.html