A horizontal half-wave dipole becomes a nvis antenna when it is installed at less than 1/4 wavelength above ground<

Portable antenna for 80m - 40m - 30m band,radiant up to a radius of approx. 300 km. 100 watt cw max 50 ohms, coax balun

There are claims circulating that placing an antenna at very low heights enhances nvis operation, or that an antenna has to be very low to be an nvis antenna

As user of mf/hf frequencies, a dedicated a near vertical incident skywave nvis is a requirement and not an option in my opinion, in addition a broadband nvis antenna

The measurements below are for building a double extended zepp near vertical incident skywave nvis antenna

This describes a portable antenna system that can provide both fifty mile range on 2 meters and 300 mile NVIS HF coverage on the 40M and 75M band

Dipolo caricato sulle bande dei 40m-80m

I have been asked many times to explain how to adapt a tunable buried counterpoise system to a horizontal loop nvis

If the dipole is close to the ground, most of the signal will be more or less vertical, this is the principle of the NVIS antenna

Atmospheric noise is less noticeable when using the nvis antenna, particu­larly on forty meters

Nvis sta per near-vertical incidence skywave, viene utilizzato per distanze da locali a medie in hf

The major lobe is between 75 and 90 degrees to the earth’s surface, this will provide excellent omni-directional

Nvis, thanks to its low installation from the ground, has a radiation pattern directed upwards

Nvis antenna for 80-60-40 meter with balun 1.1, for lengths of 1/4, 80m 62 feet,18.90 meter, 60m 44 feet/13.42 meter, 40m 32 feet, 9.8 meter

The 1/4 wavelength wire element is one half of this type of antenna, and the 5000 lbs. of steel in the land cruiser or your vehicle is the other half

An easy to build NVIS emergency HF antenna