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?

  1. A horizontal dipole placed between 1/10 and 1/4 wavelength above the ground
  2. A vertical antenna placed between 1/4 and 1/2 wavelength above the ground
  3. A left-hand circularly polarized antenna
  4. A right-hand circularly polarized antenna