NTi

NTi HF/VHF/UHF Active Antennas

Info

NTI is known for developing high‑quality, low‑noise, wideband active antennas for HF, VHF, and UHF monitoring. Their products are widely used by radio enthusiasts, COMINT users, broadband receiver owners, and SDR operators.
If space is limited, or if you live in an area where visible antennas are considered undesirable—or if you need a compact mobile solution—then these NTI antennas are an excellent choice.

Key Facts

  • Extremely wide frequency coverage (up to 3 GHz)
  • Compact, discreet radiator elements (10 cm, 18 cm, 22 cm variants)
  • Very high linearity (IP3 typically > +30 dBm)
  • Low noise design suitable for urban environments
  • Dual power options (DC or USB), ideal for fixed or portable use

Overview

NTi GA3005 HF/VH/UHF Activa Antenna

The low‑noise and high‑quality GigActiv GA3005 extremely wideband active antenna covers the complete frequency range from 9 kHz to 3 GHz, making it particularly attractive for owners of broadband receivers. With a radiator length of just under 10 cm, the antenna can be mounted discreetly.

Regarding the supply voltage, the antenna can be powered with 5.5–12 V DC (max. 120 mA), and alternatively via a special bias‑T with only 5 V via USB for portable use, with slightly reduced performance.

In the shortwave range around 7 MHz, an IP3 value of typically > +30 dBm is achieved, as well as in the range from 200 MHz upward.

  • Ultra-wide-band design 9 kHz to 3 GHz
  • Compact and lightweight design
  • Perfect for mobile use
  • Almost invisible, discreet
  • The supply voltage is 5 - 15V DC (max. 120mA) and can therefore be used with and USB Power bank.

NTi MA305FT HF Active Antenna

This low‑noise active antenna, manufactured to the highest quality standards, covers the frequency range from 9 kHz to 300 MHz.
With a radiating element of only 22 cm, it can be installed discreetly and without attracting attention.
The antenna features integrated dual surge protection for the active components.

  • HF from 9kHz - 300 MHz
  • The antenna can be easily hidden. whip is only 22 cm
  • Switchable FM notch filter
  • Protection by gas discharge tubes
  • Omnidirectional reception
  • Compact and lightweight design
  • Perfect for mobile use
  • The supply voltage is 5 - 15V DC (max. 120mA) and can therefore be used with and USB Power bank

NTi MegaDipol DX HF Active Dipol

The MegaDipol 300DX is a broadband active dipole with a maximum upper working frequency of 300 MHz. The dipole reacts to the electrical component (E-Field) of the electromagnetic field and will deliver best results regarding signal strength and SNR (signal -to-noise-ratio) at locations with little or no locally generated interference.
In contrast to simple E-field antennas with only one radiating element, the symmetrical construction of the MegaDipol 300DX, will result in almost no negative resonance effects or reflections caused by the coaxial cable.
Particularly in electrically quiet environments, it can really play to its strength in efficiently amplifying weak signals. In practical operations, a maximum signal-to-noise ratio of 110dB was achieved!

  • Ultra-wideband design from 9kHz - 300 MHz
  • Compact and lightweight design
  • Horizontal or vertical installation
  • Low noise E-field antenna as symmetrical
  • Can be powered either by a conventional plug power supply (5,5 / 2,1mm round plug) or via USB with an optional cable

NTi MegaLoop FX HF Active Loop Antenna

The MegaLoop FX makes the most diverse radiating elements possible. As standard, a loop made of flexible PVC-coated and seawater-resistant (V4A) stainless steel wire is available.
Additionally, an aluminum rigid loop with a diameter of 80 cm is also available. Due to its versatility and adjustment of amplification, there will always be an ideal combination of the loop size and amplification.

  • Ultra-wideband design from 9 kHz - 180 MHz
  • High dynamic range with an IP of typ. +40 dB and IP 2 of typ. +85 dB
  • Compact and lightweight design
  • Perfect for mobile use
  • Low Noise as H-Field is used
  • Rigid loop or stainless steel cable

Technical Data

Feature GA3005 MA305 MegaDipol MD300 MegaLoop FX
Frequency range 9kHz - 3GHz 9kHz - 300 MHz 9kHz - 300 MHz 9kHz - 180 MHz
Gain, FM Band Stop Off + 3dB + 3dB 0dB Gain: 9 kHz - 300 MHz
3dB Gain: 9 kHz - 130 MHz		 High: 25 dB (9 kHz- 110 MHz)
Medium: 20 dB (9 kHz- 150 MHz)
Low: 15 dB (9 kHz- 180 MHz)
Gain, FM Band Stop On NA 9 kHz - 52 MHz, + 3 dB
88 MHz - 108 MHz , -20 dB		 NA High: 25 dB (9 kHz- 52 MHz)
Medium: 20 dB (9 kHz- 60 MHz)
Low: 15 dB (9 kHz- 66 MHz)
Antenna Size 10 cm
(alternative 40 cm)		 22 cm 2 x 2.5m 5 m stainless steel cable
IP3, Typ > +30 dBm > +30 dBm > +30 dBm > +40 dBm
IP2, Typ > +50 dBm > +50 dBm > +78 dBm > +85 dBm
Impedance 50 Ohm 50 Ohm 50 Ohm 50 Ohm
Housing 98 x 90 x 38 mm, IP65 98 mm x 90 mm x 38 mm, IP65 98 mm x 90 mm x 38 mm, IP65 98 mm x 90 mm x 38 mm, IP65
Weight 0.12 kg 0.12 kg 0.12 kg 0.12 kg
Power Supply, 2.1 mm pin 5 - 12.5 DC (120mA max) 5 - 15 DC (typ. 20mA, 40mA max) 10 - 15 V DC (typ. 40mA)
5V via USB, with slightly reduced performance		 5 - 15 DC (typ. 20mA, 40mA max)
Connector BNC BNC BNC BNC
Operating temperature range 20 to +60 grd C -20 to +60 grd C -20 to +60 grd C -20 to +60 grd C
Scope of delivery GigActive GA3005
Rod
Power inserter		 MegActiv MA305FT
Rod
Power inserter		 MegaDipol MD300DX
Power Inserter
2x 2.5m long radiating elements
(PVC-coated, salt-water resistant stainless steel ropes)
2 insulators for installation		 MegaLoop FX
5m PVC-coated, seawater-resistant stainless steel wire
Power inserter
Options        
Power supply with noise filter + + + +
Antenna mast mounting bracket + + + +
Common mode noise filter + + + +
Galvanic Antenna isolator + + + +
Rigid loop 80 cm       +
Weather protection case     + +