600 meter band

500 khz qso Norway - England My power is 25 Watts, a homemade transmitter, antenne is a 3.
The 600 meter (or 630 meter) amateur radio band is a frequency band allocated by the International Telecommunication Union (ITU) to amateur radio operators,  ‎ History · ‎ Countries in which operation · ‎ See also · ‎ References.
Here is a short video showing what I have and can decode on the 600 meter band. Specifically kHz. Kenwood R-600 49 meter Shortwave band
Any new spectrum is desirable. RX amplified loops, kite, ultra-light, stealth balloon antennas. Operating with a homebrew DC receiver where a lumped-constant notch can remove the "unwanted side" and building RX up-converters, transmitters and transverters. Newington, CT: American Radio Relay League. That's "Earth Frequencies" It will be mind blowing. It works very well.