Included
- Four antenna elements with attached support lines
- Crossed-dipole center assembly
- Ground hardware and storage components listed by the current guide
Crossed-dipole near-vertical incidence skywave system
A self-guying crossed-dipole field antenna built around two sloping dipoles at a controlled 90-degree angle.
Built for a real operating goal
Build a repeatable regional HF station when nearby coverage matters most
CHA NVIS is a purpose-built crossed-dipole system for high-angle HF coverage, giving field teams a controlled alternative to guessing at wire lengths and improvised support geometry.
Two dipole pairs cross at 90 degrees around an approximately 15-foot center support and also provide the guying geometry. The result is a portable regional-communications antenna whose layout, wire positions, and power limits are already defined in the guide.
- Frequency1.8–54 MHz; tuner required on most frequencies
- GeometryOne 38 ft dipole pair and one 25 ft dipole pair crossed at 90 degrees
- Center heightApproximately 15 ft
- Power100 W SSB, 50 W CW/FM, 25 W continuous or digital
Picture the setup before you buy
See how this antenna works in the field
This official installation reference makes the antenna’s footprint, component order, and deployment style easier to understand at a glance.
Complete product reference
Key specifications
- Frequency
- 1.8–54 MHz; tuner required on most frequencies
- Geometry
- One 38 ft dipole pair and one 25 ft dipole pair crossed at 90 degrees
- Center height
- Approximately 15 ft
- Power
- 100 W SSB, 50 W CW/FM, 25 W continuous or digital
- Typical SWR
- Less than 3:1 except near the guide-noted regions around 5.5 and 9.8 MHz
- Setup
- Two operators, approximately 15 minutes
Know the complete setup before you transmit
Included equipment and documented configurations
Documented configurations
- Cross the two dipoles at 90 degrees
- Keep the center near 15 ft
- Use a mast or suitable tree support with the self-guying geometry intact
Configuration boundary: Do not replace the crossed geometry with a generic dipole. The 38 ft and 25 ft pairs have defined positions. Use the current 100/50/25 W limits, not stale higher values.
Coverage & Pattern
See the reviewed 2D and interactive 3D patterns
Use only a model that matches this exact antenna configuration, band, height, ground, feed, and RF return.
