Aziloop DF-72 Multi-Directional VLF-HF RX Antenna System

Aziloop DF-72 is a dual-mode, electronically steerable receive antenna system for low-noise VLF to HF listening and DX work. Built for serious SWLs, MW DXers, and radio amateurs who need better signal-to-noise ratio on challenging bands, it delivers directional control without a mechanical rotator, using a compact, low-visual-impact loop setup and single-coax feed architecture.

Overview

The QuietRadio Aziloop DF-72 is a dual-mode, multi-directional receive antenna system for VLF to HF with capabilities that are exceptional at this price point. It uses a low-visual-impact, small-footprint antenna concept based on two orthogonal loops plus earth, then applies Stepped-Azimuth technology so direction changes are electronic while the physical antenna remains stationary. This gives fast, practical control of signal peaking and interference nulling for DXers, SWLs, and demanding low-band HF operators.

Key Features

• Dual-mode multi-directional reception from VLF through HF
• Low visual impact, small footprint antenna concept using a pair of orthogonal loops plus earth
• Stepped-Azimuth electronic rotation with stationary antenna hardware
• Intuitive Windows control interface with selectable Local, Client, and Server modes
• Dual antenna modes: switch instantly between Loop mode and K9AY mode via mouse wheel or buttons
• 108 directional combinations in one system: 72 K9AY headings + 36 loop axes
• Fast change speed: direction/mode updates in approximately 60 ms
• Switchable 18 dB preamp plus 4-step attenuator (0–18 dB) for up to 36 dB total level control
• Four 7-pole preselection filters to ease receiver front-end loading
• Variable K9AY load from 250 Ω to 950 Ω in 50 Ω steps
• Two control/monitor ports for user functions or assignment to one/both PTT muting roles
• Headless remote control (no attached PC) via built-in Ethernet server
• Omni-Rig support for auto-filter, PTT muting, and Rig-Sync (keeping Rig A and Rig B aligned)

User applications

• Quiet low-band DXing on 160 m and 80 m where receive SNR often limits results
• Medium-wave/LF weak-signal work with rapid peak/null steering
• Remote receive sites using client/server workflows or headless Ethernet control
• Station automation with Omni-Rig, API-driven logic, and logger-integrated direction workflows
• Small city or suburban lots where compact footprint and low visual impact matter

Specifications

Why this antenna is high-value

• Advanced directional RX performance at an affordable price point
• Fast electronic heading changes without rotator mechanics
• Helps peak weak wanted signals and null local/interfering QRM quickly
• Strong fit for low-band operators where receive performance drives results
• Flexible local, network, and API control paths for modern station workflows
• Compact concept suits suburban and space-limited installations

What’s included – In the Box

• DF-X Common Interface Unit (CIU)
• DF-72 Loop Control Unit (LCU)
• DC power lead
• USB cable
• 3.5 mm to phone AUX cable
• Two SMA-to-BNC adapters

Important: The antenna element(s), mounting hardware, feeder/coax, earth implementation, and related installation materials are user-selected and are not included with the Aziloop product.

Performance notes / setup guidance

• Best gains are typically achieved when used as a dedicated receive antenna on noisy low bands.
• K9AY mode termination adjustment can materially improve rejection/QRM behavior as propagation changes day vs. night.
• For TX-capable stations, follow muting/isolation best practices and avoid applying RF to the receive path.
• Place loop elements as far as practical from transmitting antennas to reduce overload risk.
• Use attenuation/preamp/filter combinations to optimize SNR versus dynamic range at your site.
• Select the control workflow that fits your station: local control, UDP commands from logger software, full client-server operation, or API integration for automation.

Independent user feedback

“… I can confirm that it does all the things the website says it can do! … The most useful attribute I have found to date, is the ability to attenuate QRN, local QRM and Surface Radar, … Ground waves can be nulled out by up to 35 dB in K9AY mode. I can make local NDB’s ‘disappear’! The band filters are very useful too, especially in helping to minimise Broadcast Band overload. … Loop mode offers a significant reduction in common mode noise as well….”

Independent third‑party reports

• Field testing in the UK by RadCom confirmed the dual‑mode operation, electronic steering, and 108 heading combinations, supporting the system’s unique architecture and practical remote‑capable design.
• The SWLing Post highlighted unusually sharp rear nulls and strong front‑to‑back performance in K9AY mode—up to about 30 dB F/B—as well as the ability to vary terminating resistance to reduce co‑channel or adjacent channel interference and storm QRN, giving it an edge over small magnetic loop designs for some scenarios.

Explore the 100+ page manual for detailed operating guidance, integration examples, and practical antenna deployment ideas.

With its small footprint, Aziloop DF-72 is ideal even for smaller city lots, making quiet low-band DXing possible where larger receive antenna systems are impractical.

Ready to hear more and fight less noise? Add the Aziloop DF-72 to your station and upgrade your receive capability where it matters most—weak-signal copy, low-band DX, and real-world interference control.