1. Test the Ampro stick-based antenna - https://mw1cfnradio.blogspot.com/2021/05/stick-to-shore.html
2. INDEXA Spring Newsletter - https://indexa.org/documents/newsletters/Newsletter-Issue-132-Spring%202021.pdf
3. The International Amateur Radio Union Monitoring System (IARUMS) Region 1 April 2021 newsletter - https://www.iaru-r1.org/wp-content/uploads/2021/05/IARUMS-Newsletter-21-04.pdf
4. Magloop Antenna Calculator - https://miguelvaca.github.io/vk3cpu/magloop.html
5. IARU — в Конституцию внесены изменения - http://krrc.org.ua/index.php/iaru-cons/
