OctaLoop a shielded active H-field Loop antenna 1MHz – 30 MHz

Listen here (-2m ASL Lombardsijde Belgium): OctaLoop SDR

Included:

• OctaLoop Antenna (3.65m circumference)
• Stainless Steel (RVS316) Mounting Bracket
• Bias-T 13.8V F-Type to SMA
• Short SMA to BNC Cable
• 10M INTSAT-170-ELITE 75Ω coax cable with 2 F-Type Connectors

Optional:

• RVS Ground Peg (including F connector bulkhead) and RX RF Line Isolator

Product Description: The OctaLoop is a high-performance HF active shielded H-field magnetic loop antenna, engineered for exceptional low-noise signal reception. Designed for both urban and remote environments, it significantly reduces EMI and improves signal clarity.

Compact, highly sensitive, and optimized for HF monitoring, the OctaLoop is an ideal solution for shortwave listening (SWL), amateur radio DXing, and SDR applications. Its shielded magnetic loop design and build in common mode rejection, ensures superior rejection of local interference, allowing for clearer, more stable reception across the HF band.

With an impressive IP3 of +45 dBm due to a push-pull design, the OctaLoop delivers outstanding dynamic range and signal fidelity. Covering 500 kHz – 50 MHz, but optimized for HF 1MHz – 30 MHz, it is a versatile and reliable choice for serious radio enthusiasts and professional monitoring applications.

Placement Recommendations: For optimal performance, install the OctaLoop at a location well away from buildings, power lines, and other sources of electromagnetic interference (EMI). The antenna operates most effectively at a height of 1.2 to 5 metres, providing a balance between noise reduction and signal reception.

If the feedline to the loop is longer than 10 metres, you can install a CMR choke midway along the feedline to minimise noise.

Grounding: For improved performance, grounding the braid of the coaxial cable feedline to a proper earth ground is highly recommended. Avoid grounding the coaxial cable to the mast itself—grounding should be performed at the base of the mast instead.

Test It Yourself!
Experience the OctaLoop’s performance in real-time by tuning into one of our SDR receivers: https://rf.guru/sdr

Do you need a rotor ? Understanding the Null of a Shielded Active H-Field Loop Antenna

Why an Octaloop is Superior to a Square or Circular Loop Antenna

Technical Data:

• Frequency Range: 500 kHz – 50 MHz
• Impedance: 75 Ohm
• Power Supply: 13.8V, approx. 180mA
• Polarization: Horizontal
• Connection: F-Connector
• Antenna Size: 1.2m diameter, 3.65m circumference
• Weight: Approx. 1.2 kg
• Working Temperature: -20°C to +50°C
• Pole Mount: 30-68 mm

Scope of Delivery:

• OctaLoop Antenna with enclosure and mounting bracket
• Bias-T Power Injector
• 10m INTSAT-170-ELITE 75Ω coaxial cable with F-Type connectors
• SMA-to-BNC adapter cable

Upgrade your HF reception with the OctaLoop – engineered for precision, built for performance.