Number stations and other shortwave radio oddities

Hey guyz

I'm about to start the course to get my HAM license and started looking for "number stations".
No one really knows what number stations are, although I'm sure they are a way to transmit messages
to spies overseas, who else but a government could have stations with the power to transmit non stop
weird shit into the air since WWII?

If you are curious about this stuff you can check this site called Mystery Signals of the Short Wave
that's great for starters and for sure will get you hooked into the subject.

Then you can visit www.enigma2000.org.uk where you can continue your research, and enjoy an
awesome FAQ document.

Also I'd like to share with you this video, where you can see a collection of weird stuff there is or was
in the airwaves.

Enjoy

Various recordings of shortwave radio oddities, numbers and noise stations. These mysterious 
broadcasts are found on shortwave bands and they are - or appear to be - with no definite purpose. 
These signals are said to actively haunt the airwaves after World War II at beginning of the Cold War. 
With the collapse of the Soviet Union many expect these stations to disappear overtime but radio 
monitors indicate these signals continue to exist with new ones surfacing every now and then along 
with stations that have operated for 30 years.

So what are they? There are many speculations what these numbers stations are; theories point to 
covert government-sponsored broadcasts for spies abroad, illegal activities such as drug trafficking, 
for various scientific research and undisclosed military operations. However, to this day, no 
 organization, broadcaster or country ever admitted the use of these stations.