Extended Double Zepp Antenna Calculator - West Mountain Radio
Understanding NVIS - YouTube
NVIS (160m), HamSphere 5.0 Shop
NVIS antenna CHAMELEON EMCOMM III from 1.8 to 30 MHz
Anton's Funkperlen: Eine kleine NVIS-Antenne für 1.8-7.2 MHz
Near Vertical Incidence Skywave (NVIS)
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