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2006 Avanti installed shark fin antenna. The antenna has an amplifier. The secret to make it work was installing a ground plate , piece of sheet metal inside the trunk holding antenna. This made a huge difference. Shark Fin AM FM Amplified Amplifier Marine Car Truck Offroad Antenna Stereo Radio 12V https://www.amazon.com/dp/B0765B38QV/ref=cm_sw_r_em_apa_i_YM-gDb1MMKK60