AM Radio Reception

[Tailwind]

Hi All
Can I get responses from owners with CDR220 regarding AM radio? My FM is fine, and radio works well for the most part, but is strongly jammed by radiation, i.e. electric busses and trucks with telemetry transmitters, not to mention fringe reception. I've done the grounding screw sanding the paint on the antenna booster in the PS A pillar, and it does cut out if I unplug it. Is this typical of this radio. My car is a '99.
Reason I ask is I want to replace the head with a modern one with USB to listen to my mixes, but I listen to AM talk often. Should I replace the antenna booster? Can you guys chime in on what model head you'd recommend for my car?

TIA