this guy is hilarious
https://www.youtube.com/watch?v=muL6hl5lL1A
https://youtu.be/RxMYvPy8QwA?t=1m35s
http://websdr.ewi.utwente.nl:8901/
http://hisz.rsoe.hu/alertmap/index2.php?area=usa
http://everynoise.com/engenremap.html
https://www.youtube.com/watch?v=eRcNJToCIl4