1. SOTAmat (SOTAmāt (автоматизація різноманітних заходів SOTA і POTA) - https://sotamat.com/
** How to Self-Spot Off-Grid for SOTA/POTA Using HF - https://hamradiooutsidethebox.ca/2023/08/30/how-to-self-spot-off-grid-for-sota-pota-using-hf/
2. World of Receivers and Transmitters - https://rx-tx.info/
3. Awards HamSphere 5.0 - https://hs50.hamsphere.com/awards
** HamSphere v5.006 - https://hs50.hamsphere.com/download.php
4. DX Commander Rapide HF Multiband Vertical Antenna Product Review (Багатодіапазонна вертикальна антена DX Commander Rapide Огляд продукту) - https://www.onallbands.com/dx-commander-rapide-hf-multiband-vertical-antenna-product-review/
** Ultimate Guide - How to Build a DX Commander 2022 - https://www.youtube.com/watch?v=oECpgezSPQs
** Unified Antenna Kit - User Guide - https://static.dxengineering.com/global/images/instructions/dxc-classic.pdf
5. HB9CV Antenna Calculator - https://www.changpuak.ch/electronics/HB9CV.php
** Yagi Uda Antenna Calculator - https://www.changpuak.ch/electronics/yagi_uda_antenna.php
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