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Overview
The Robofusion A5800 is a 5.8GHz omnidirectional dipole antenna purpose-matched to the VT5804 and VT5805 analog video transmitters. Built with LDS (Laser Direct Structuring) — the antenna element is laser-drawn onto a molded carrier, so every unit is tuned identically — and protected by a semi-transparent radome. Unlike most FPV antennas sold on marketing claims, the A5800 ships with a complete anechoic-chamber lab report: measured VSWR, gain, efficiency, and full radiation patterns, all published in our knowledge base.
Sold as a 2-pack — the antenna is the first thing to take a hit in any rough landing, and a matched spare in your field bag means the session doesn't end there.
Lab-Measured Performance
Gain: up to 3.56dBi measured (3.0dBi nominal) — the right figure for an aircraft-side omni: even coverage in every direction, no deep overhead nulls
Radiation efficiency: 60–84% at every point from 5350–5900MHz — cheap FPV whips typically sit at 30–50%
VSWR: 1.25–1.87 across the design band, well under the 2.0 spec limit
Frequency
Measured VSWR
Power reflected back into your VTX
5350MHz
1.77
~7.7%
5550MHz
1.26
~1.3%
5750MHz
1.25
~1.2%
5850MHz
1.87
~9.1%
Why VSWR matters: any mismatch reflects transmit power straight back into the VTX output stage. At 2.5–4W that reflected power becomes heat inside your transmitter — a well-matched antenna like this one is cheap insurance for a high-power module. Full test data, charts, and radiation patterns: A5800 Lab Test Report.
Specifications
Antenna type
Dipole, omnidirectional (LDS)
Design frequency range
5350–5850MHz
Peak gain
3.0dBi nominal (3.56dBi measured)
Radiation efficiency
>60% across the band (max 83.6%)
VSWR
<2.0 (measured 1.25–1.87)
Impedance
50Ω
Connector
SMA (male pin), 8.0mm hex
Overall length
178 ± 1mm
Radome
Semi-transparent housing, Ø18.27mm head
Cable
RG141, black, heat-shrink strain relief
Operating temperature
−30°C to +85°C
Mounting Tip
A dipole radiates a "donut" pattern with nulls off its tip. Mount the A5800 vertically (radome up or down) so the strong equator of the pattern sweeps the horizon — video stays steady as the aircraft turns. Never point the antenna tip at your ground station. The RG141 lead is stiff-but-formable: bend it gently to route the antenna and it holds position. Full guidance with measured pattern plots: radiation patterns explained.
Compatibility
Connects to the VT5804 (2.5W) and VT5805 (4W) video transmitter modules via the MMCX extension feeder included with each module. The 5350–5850MHz design band covers the LOW band, Raceband, FS/IRC, and A/B bands — everything North American pilots normally fly. (The three highest E-band channels, 5905–5945MHz, sit above the design band.)
