RadioBanter - Car Radio Reception

Hi,

I am looking for a new Car Radio/CD, to solve terrible reception
problems I have
- probably a manufacturing flaw with the car the manufacurer supplied
radio- changed both (to same model) and the problems presist, no FM
station holds for more than a minute anyhwere in the country- either in
manual and auto scan, while in my house even the cheapest radio
transistor works fine.

I thought of DEHP4750MP Pioneer, it lists "IIID SuperTuner" as a
feature, whatever that is?
Then saw that it doesn't support RDS. Seems strange for such an
advanced piece of technology. Anyway in another Cadence model, it is
advertised as having "Radio sensitivity" of 10dB-UV to 30dB, what does
that mean and what values should I be looking for to get maximum
sensitivity?

thank you!