-Links from the 2018 "LF Forum" presentation.

http://www.gw3uep.ukfsn.org

http://njdtechnologies.net/category/630-meter-daily-reports/

http://www.472khz.org

http://www.antennasbyn6lf.com/630m-antennas/

http://www.g0mrf.com/

https://sites.google.com/site/g3xbmqrp3/mflf/472khz_tvtr

http://www.linamp.co.uk/gemini_HF.html

https://italab.it/prodotti_uk.php?cat=3