Hello,
yesterday I used rtl_power to create another heatmap. It covers the frequency range from 3 MHz to 5 Mhz.
Have a look at here, please:
http://www.qth.at/de8msh/bilder/heatmaps/hf.png
ATTENTION: this picture has a size of 17 MB! :)
As you can see there are many stations that come an go again. Ham radio stations, BC stations, Stanag 4285 and many more...
