4289-2W Double Tilt Whip Adaptor

4289-2W Double Tilt Whip Adaptor

Forward Or Reverse Tilt Whip Adaptor With 120-49 NVIS Base For 16′ Antennas

The purpose of NVIS (Near Vertical Incident Signal) is to enable communications in the area commonly called the “Skip Zone” or “Dead Area.” This is accomplished by tilting the antenna so that its main radiating lobe is 73° to 83° above the horizon. The higher radiating lobe causes the signal to bounce off the ionosphere, returning to the earth in the dead area that may occur 10 to 150 miles out when using the antenna vertically.

The HF band is home to the most effective frequencies for NVIS applications: 4 to 12 MHz. Shakespeare’s Model 120 system is NVIS ready. The Model 4289-2W includes the tilt adaptor and the 120-49 Spring Base. For information about NVIS using Tilt Whip adaptors contact Shakespeare.

  • Antenna spring base with tilt adaptor, built together as a single unit
  • Use with 16′ antenna only
  • Forward or reverse tilt
  • Spring-loaded locking pin permits quick change of tilt settings: at vertical, 50°, 70°, and 90°
  • Feed-through design, 5/16″ threaded rod with hex nut feed point
  • Height: 20.5″ nom.
  • Bolt Holes: 4 each 3/8″ dia. holes on a 4.5″ BHC
  • Supplied with 3/8″ stainless steel mounting bolts and hardware
  • Use with 120-HVPDR for high voltage protection

NSN: 5985014936278  

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