1. L-Match Tuner Build for QRP Operation - https://miscdotgeek.com/qrp-l-match-tuner-build/
2. VK1AD: 2m Slim Jim Antenna for SOTA - https://vk1nam.wordpress.com/2013/06/04/2m-slim-jim-antenna-for-sota/
3. AURORA forecast (прогноз на УКХ) - https://www.gi.alaska.edu/monitors/aurora-forecast
4. How to easily receive and decode CUBESAT telemetry? (Як легко отримувати та декодувати телеметрію CUBESAT?) - https://hamprojects.wordpress.com/2021/05/25/how-to-easily-receive-and-decode-cubesat-telemetry/
5. New for 2021: Addition of Youth Overlay category(V.B.3) and Explorer category (V.D) (Нові категорії в CQ World-Wide DX Contest) - https://www.cqww.com/rules.htm