Which of the following antenna types will be most effective as a near vertical incidence skywave (NVIS) antenna for short-skip communications on 40 meters during the day?
AnswerA horizontal dipole placed between 1/10 and 1/4 wavelength above the ground
NVIS requires strong high-angle radiation. A horizontal 40-meter dipole only about one-tenth to one-quarter wavelength above ground directs substantial energy nearly straight upward.