I use 88.1 works with no static just set it as a favorite on FM
now that tesla has released the parts catalog for model 3, i wonder if this helps...
https://epc.teslamotors.com/#/systemGroups/47382
there's an antenna amplifier somewhere. i'm wondering if that's where we can tap into (it appears there is a normal antenna connector on the end, from looking at the drawing)...no idea where this is in the car, though.