Poor FM reception 2010 CX-9: Antenna upgrade?

Hi All,
I just bought a first gen CX-9 and the FM radio reception isn't that great. I've read that the FM radio is embedded in the rear window. Has anyone fitted an external antenna, sharkfin or otherwise, to fix this?

Similar, but separate, I've also noticed that a cigarette port to USB adaptor causes radio static if put in the armrest port - Anyone else get this?