If you want to keep in touch with the world's events by tuning into the BBC World Service, VOA and CNN (sound track from their TV transmission), then take a WorldSpace satellite radio. You won't suffer from sunspots, changing frequencies, background noise and all the other delights which you get thrown in with shortwave broadcasts for free.
WorldSpace is a radio system which uses satellites to transmit the programmes. There is a choice of radio sets from recognised hi-fi manufacturers (Hitachi, JVC, etc).
There are downfalls to the system. As with all satellite systems, your radio's antennae requires "line of sight" to the satellite covering your area. With a little planning, this can be achieved in most places.
As well as the radio set, you should additionally take an external antennae (available from WorldSpace). This can be fixed to a post outside the vehicle, allowing use of the radio inside the vehicle while stationary.
For further information, wander onto their web site. See the "links" section of this web site.