VLF 5.17kHz 6.47kHz 8.27kHz
136kHz
DM4TR http://dm4tr.bplaced.net
JA8SCD http://icas.to/argo/
PSK Automatic Propagation Reporter https://pskreporter.info/pskmap
472kHz
.
Weak Signal Propagation Reporter Network http://dev.wsprnet.org/drupal/wsprnet/map
Author: Marcin Skóra SQ2BXI