i have a little clarity dab adaptor that does both, it plays over fm or will play through aux. the sound is better through aux than the fm, so i leave it on that.
i found dabonwheels to be excellent. theyre cheap enough and let you try and send back if you dont get on with the products. excellent customer service.
EDIT: +1 on the aerial. trial and error led me to buy a magnetic aerial which i stick on my tailgate. the windscreen ones were rubbish. like i say tho, if it doesnt work to your satisfaction you can return it.