Like BDA I don't have anything special in terms of radio suppression. Petronix ignition, 5k resistance NGK plug caps with copper wires and that's about it.
These days I usually have an SD card with tracks played at random from a relatively cheap media player. The radio is hooked up with a small amplified aerial hidden at the front of the car and does work reasonably well with mainstream and local stations on FM.
It might be down to modern electronics but I don't recall any problems with reception even back in the 80s/90s with FM, conventional aerials coming up from the front wing and decent radios like Radiomobile, etc.
Brian