Something like this, run it up the A pillar and stick it at the top of your windshield.
Krator® Hidden Antenna - Fits Car, Truck, Motorcycle, Harley, Boat, Golf Cart, Campers, Amplified Antenna AM FM WB Universal Fit For All Applications AM FM Car Radio Stereo Windshield Hidden Antenna https://www.amazon.com/dp/B001QYSXAS/ref=cm_sw_r_other_awd_Fv2Zwb5838B4V