<sigh> I must have written this half a dozen times by now....oh heck, what's one more?
I've constructed a Wiki for both HF listening and utilities which lists a few popular places (such as Eham) where you can read online reviews (some user reviews, others a bit more in depth). RadioIntel has an extensive set of links for this on 2 seperate pages; take your time and do your research. You need to narrow your needs between portables and tabletops, as there is a VAST difference of performance characteristics between the 2.
As to numbers stations - yes, I've heard a few as well; some of them are thought to be run by the Mossad (Isreali secret service), and I've also heard a few in Spanish as well. There are also numbers stations that use CW....
All the answers I've been seeing here have to do with utility or clandestine, but miss the broadcast topic completly, so here goes...
- In many cases, you will hear a foreign language that is spoken by a native. If you study languages, there's no better way to practice listening - and understanding - a language, with its nuances and accents then to hear it from a native. This is particularly true of the smaller, more regional stations such as those from Latin America
- You get a viewpoint about America from someone not of this country. If you are involved at all in a job that represents foreign interests, or has foreign clients, this can be to your advantage. In addition it's worthwhile just from a purely educational viewpoint
- If you are a music buff, you will get to hear styles and varieites you will never hear on a US outlet.
73s Mike