Re: Wavelength in kHz?
In the last 10 years or so I've come across a couple of Mercedes car radios that support 49m shortwave. Presumably, normally fitted to their cars that go to Africa or somewhere. Both had very poor reception in the UK, presumably as the antenna fitted here does not match well at 6Mhz.
I've no idea if all MB have SW, or just a small number of basic models.