Anton's Funkperlen: Eine kleine NVIS-Antenne für 1.8-7.2 MHz
Near Vertical Incidence Skywave Antenna page
richtige NVIS-Antenne 2 - Antennen - Forum für QRP und Selbstbau im Amateurfunk
Trent Telenko on X: "radio to maintain contact with the CP/LCC & TZM-360 transporter/transloader. NVIS Skywave HF radio is immune to satellite intercept and ground/air intercept requires trucks & aircraft carrying SIGINT
80 Meter NVIS Antenna | W3ATB
NVIS -Near Vertical Incidence Skywave: Why You Need It. - Off Grid Ham