And a lot more receivers are available, all over the world: http://websdr.org/ http://websdr.org/ Also interesting: Live reports of radio amateur transmissions

And a lot more receivers are available, all over the world: http://websdr.org/ http://websdr.org/ Also interesting: Live reports of radio amateur transmissions via https://www.pskreporter.info/ https://www.pskreporter.info/ and http://www.reversebeacon.net/ http://www.reversebeacon.net/ Amateur Radio is a great hobby that will give you unlimited possibilities to play and learn. From tube transmitters in Morse code (which is still a thing, and it's fun) to sophisticated weak-signal modes like FT8.