Fond this nice prog !! http://www.erikyyy.de/tempest/

It's a showcase and proof of concept for Tempest
and it realy works !!!

Tempest for Eliza is a Program that uses your computer monitor
to send out AM radio signals. You can then hear computer
generated music in your radio.

For those that don't know what Tempest is: http://www.eskimo.com/~joelm/tempest.html