HELIX PRO_18 - Professional 5.8GHz Helical Antenna System for FPV Repeater Drones

Technical Specifications

• Frequency Range: 5640-5945 MHz
• Design: Advanced 18-turn helical configuration
• Polarization: RHCP (Right Hand Circular Polarized) or LHCP options
• Maximum Gain: 16dBi
• Beam Width: 25° core beam (expanding to 50° at closer ranges)
• VSWR Rating: Exceptional <1.2
• Return Loss: -27dB
• Signal Efficiency: 99.8%
• Effective Bandwidth: 130MHz at vswr below 1.1
• Impedance: 50 Ohm standard
• Connection: Premium SMA or RP-SMA options
• Reflector: 45mm aerospace-grade laminate
• Conductor: 1.2mm pure copper with specialized enamel coating
• Cable: Military-grade RG402 semi-rigid
• Cable Length: 12cm (optimal for direct mounting)
• Power Handling: 50W maximum input
• Weight Per Antenna: 40g (optimized for flight performance)
• Proven Range: 20KM+ in optimal conditions

Specialized FPV Repeater Drone System

The HELIX PRO-18 is specifically engineered for FPV relay/repeater drone applications, enabling breakthrough long-distance flights that were previously impossible. This specialized system transforms your drone into a powerful aerial signal relay station that extends your operational range beyond 20KM while maintaining crystal-clear video transmission.

Our proprietary 6° dual-antenna alignment is precision-calibrated for optimal performance in repeater configurations. This expert arrangement ensures maximum signal coverage both to your primary flight drone and back to your ground station, creating a reliable communication bridge that extends your effective range exponentially.



FPV Repeater Technology Advantages

The HELIX PRO-18 repeater antenna system solves the key challenges of deploying an effective aerial signal relay:

• Extended Com0munication Chain: Create multi-point communication networks allowing flights far beyond visual range
• Signal Regeneration: Clean signal reception and retransmission eliminates cumulative noise and degradation
• Simplified Installation: Purpose-designed mounting system integrates perfectly with standard repeater drone frames
• Optimized Weight Distribution: Strategic 6° antenna positioning maintains stable flight characteristics
• Minimal Interference.

Engineering Excellence

Each HELIX PRO-18 antenna is individually tuned and tested to deliver exceptional RF performance. The specialized helix design creates perfect circular polarization, dramatically reducing multipath interference while maximizing penetration through obstacles.

The premium semi-rigid RG402 cable backbone allows for adjustable positioning without signal degradation. Unlike standard cables that lose performance when bent, our semi-rigid design maintains signal integrity regardless of positioning - perfect for the precise alignment required in repeater applications.

Performance Benefits

• Maximum Range: Proven 20KM+ transmission capability in optimal conditions
• Network Expansion: Create multi-node relay networks for virtually unlimited range
• Penetration Power: Superior obstacle penetration capability through circular polarization
• Signal Quality: Minimal noise floor with exceptionally clean signal reception and retransmission
• Diversity Optimization: The precisely calculated 6° offset maximizes diversity receiver performance
• Consistent Performance: Every antenna pair is factory-matched for identical performance characteristics

Advanced Repeater Applications

• Beyond visual line of sight (BVLOS) operations
• Long-range professional cinematography through signal relays
• Mountain or canyon exploration with signal repeating
• Over-the-horizon drone operations
• Extended industrial inspections of pipelines, power lines, and large facilities
• Search and rescue operations with extended communications range
• Tactical reconnaissance and surveillance with extended operational radius

Complete System Includes

• HELIX PRO-18 precision-tuned helical antennas
• universal mounting bracket - assembled
• Frequency response certification labels with basic information of tuning each antenna.

Whole system weight - about 90g.

Transform your drone into a powerful signal relay station and explore beyond the horizon

Why Antenna Matching is a Big Deal for 5.8 GHz Systems

If you’re working with wireless systems in the 5.8 GHz range, getting your antennas matched correctly is super important. When antennas are tuned to the same frequency range, they work together like a well-oiled machine, giving you strong signals, fewer problems, and reliable performance.

What Happens When Antennas Don’t Match?

Let’s say you have two antennas:

• Antenna A: Works great at 5640 MHz with a VSWR of 1.1 (which is excellent). But at 5900 MHz, its VSWR jumps to 2.5, meaning it reflects a lot of the signal instead of sending it out.

• Antenna B: Works great at 5900 MHz with a VSWR of 1.1, but at 5640 MHz, its VSWR goes up to 2, causing similar issues.

This mismatch causes a bunch of problems:

1. Wasted Signals: When the VSWR is high, the antenna reflects power back to the transmitter instead of sending it out. This weakens your signal and shortens the communication range.

2. Transmitter Troubles: That reflected power doesn’t just disappear—it goes back into your transmitter, which can overheat and even get damaged over time. It’s like trying to push water through a clogged pipe; eventually, something’s going to give.

3. Inconsistent Performance: If your system needs to work across a range of frequencies (like 5640–5900 MHz), mismatched antennas will make performance unpredictable. One frequency might work fine, while another struggles.

What About Axial Ratio?

The axial ratio tells you how well an antenna handles circular polarization. A low axial ratio (close to 1 or 0 dB) is great—it means the antenna is doing its job well. A high axial ratio means the antenna is less efficient, which can cause:

• Weaker Signals: The antenna won’t pick up or send out signals as effectively.

• More Interference: In environments with lots of reflections (like cities or indoors), a poor axial ratio can make interference worse.

• Mismatched Polarization: If the antennas at both ends of the link have different axial ratios, they won’t “talk” to each other as well, further reducing performance.

Why Matching Your Antennas is the Best Move

When you order antennas that are tuned to the same frequency range (like 5640–5900 MHz), you get:

• Low VSWR Across the Board: The antennas will work efficiently at all frequencies in the range, with minimal signal reflection.

• Great Axial Ratio: The antennas will maintain good circular polarization, reducing interference and improving signal strength.

• Happy Transmitters: With less reflected power, your transmitter stays cool and lasts longer.

• Cost Savings: You won’t need to spend extra time or money tuning or replacing mismatched antennas.

As an antenna manufacturer, we make sure every antenna we deliver is tuned to your exact needs, so your system runs smoothly and reliably. No mismatches, no headaches—just great performance.