Morad HF Vertical Array High-Gain Vertical Antenna for Long-Range HF Communications at Fixed and Field Installations

The Morad HF Vertical Array is the dual stacked dipole vertical antenna designed for high-performance HF stations that need maximum gain in omnidirectional radiation across the 2-30 MHz frequency range — covering the full military HF band — without the radiation pattern compromises of horizontal wire antennas or the need for reorientation to reach targets in different geographic directions, which are the main limiters of directional HF antennas at barracks installations or field posts covering multiple azimuths simultaneously.

The vertically stacked dual dipole configuration separates the elements 1.4 wavelengths at the design frequency, generating constructive interference in the horizontal plane that raises gain to 6 dBi — equivalent to quadrupling the effective radiated power of the station compared to a single dipole — with a main radiation elevation angle of 8° above the horizon that maximizes long-distance ionospheric propagation (NVIS excluded) for strategic links over 1,500 kilometers at frequencies above 8 MHz.

The multiband aperture without external tuner operates between 2 and 30 MHz with VSWR below 2.5:1 at any frequency in the range thanks to the matching network integrated in the IP67-sealed cast aluminum feed box — eliminating the need for an external automatic antenna tuner which is the highest failure-rate component in field HF installations with high humidity and variable temperature. The 6061-T6 aluminum structure with A4-316 stainless steel fasteners supports certified wind speeds up to 150 km/h without permanent deformation, and the 50 Ω feed with N-female connector at the base accepts up to 1 kW in continuous mode (CW/USB/LSB) for high-power HF transmitters at strategic stations.