I built one (homemade) for the cars that had an analog tunable radio.
Covered all SW broadcast bands (by the turn of a knob) & worked just
fine hooked up the the cars radio antenna.

My last truck though had (& present one has) a radio that tunes in
10khz steps so I just used my Icom IC706MKII-G (hooked up to a
Bugcatcher ham radio antenna) for shortwave listening when I'm not
using it for ham contacts.

Expensive (for just a shortwave radio) but if you've got a mobile HF
ham radio (with general coverage recieve) then why not use it for
shortwave? I do!

Nothing like driving to work in the morning listening to Radio
Austraila.....