Antennas

Antennas are the most underrated component in FPV. A great VTX with a bad antenna will perform worse than a budget VTX with a good antenna. Getting antennas right — type, polarization, placement, and matching between VTX and goggles — has a massive impact on range and signal quality.

Antenna Basics

Frequency

Most FPV operates on 5.8GHz. Your antennas must be designed for 5.8GHz. Using the wrong frequency antenna drastically reduces performance.

Some long-range setups use 2.4GHz or 1.3GHz for video — these require appropriately sized antennas (larger for lower frequencies).

Polarization

Antennas emit and receive radio waves in a specific pattern:

Circular Polarized (CP):

• RHCP (Right-Hand Circular Polarization): The standard in FPV. Most antennas sold for FPV are RHCP.
• LHCP (Left-Hand Circular Polarization): Works identically, just opposite rotation.
• VTX and VRX antennas must match — both RHCP or both LHCP. Mismatched polarization costs ~3dB (roughly halves your range).
• CP antennas reject multipath interference (signal bouncing off buildings/ground), making them superior to linear polarized antennas in most environments.

Linear Polarized:

• Simpler, cheaper, lighter
• More susceptible to multipath interference
• Orientation-sensitive (if the TX and RX antennas aren’t aligned, signal drops)
• Common on cheap whoop VTXs and dipole antennas

Gain

Antenna gain measures how much the antenna focuses signal in a particular direction:

• 0 dBi (isotropic): Radiates equally in all directions (theoretical)
• 2-3 dBi: Typical omni-directional FPV antenna. Good coverage in all directions.
• 8-14 dBi: Directional antenna (patch, helical). Strong signal in one direction, weak in others.

Higher gain doesn’t mean “better” — it means more focused. A high-gain patch antenna pointed the wrong way gives you nothing.

Antenna Types

Omni-Directional (For VTX and Goggles)

Pagoda / Lollipop / Stubby:

• Circular polarized (RHCP/LHCP)
• ~2-3 dBi gain
• Radiates in a donut pattern (good coverage in all directions except directly above/below)
• The default choice for VTX antennas on a drone
• Lollipop-style antennas are durable with a rounded protective shell

Dipole:

• Linear polarized
• Simple, lightweight, cheap
• Common on budget receivers and tiny whoops
• Less ideal for range due to linear polarization and orientation sensitivity

Directional (For Goggles)

Patch Antenna:

• Flat panel shape
• 8-12 dBi gain
• Wide beam angle (~60-90°)
• Point it toward your flying area for extended range
• Common as the second antenna on diversity goggles

Helical Antenna:

• Spiral/helix shape
• 10-14 dBi gain
• Narrower beam angle than patch
• Higher gain but needs to be pointed more precisely
• Used for long-range setups

Crosshair Antenna:

• Hybrid design with moderate gain and wide beam
• Good balance between omni and directional
• Popular for FPV diversity setups

VTX Antenna Setup

On the drone, you typically use one omni-directional antenna:

• Mount at the rear of the frame, pointing upward
• Use a TPU antenna mount to protect the connector and set the angle
• Keep the antenna away from carbon fiber (which blocks signal)
• Avoid running the antenna alongside power wires (interference)

Connectors

• UFL/IPEX: Tiny, lightweight. Most common on modern VTXs. Fragile — don’t repeatedly unplug.
• MMCX: Slightly larger, more robust. Growing in popularity.
• SMA/RP-SMA: Threaded connector. Most durable but heaviest. Check if your connector is SMA or RP-SMA (they look similar but aren’t compatible without an adapter).

Pigtails

If your VTX has a UFL connector but you want to use an SMA antenna, use a pigtail — a short cable with UFL on one end and SMA on the other. Keep pigtails short (signal loss increases with cable length).

Goggle Antenna Setup

Standard Diversity Setup

Most analog pilots use two antennas on their goggles:

1. Omni (pagoda/lollipop): Primary antenna for general coverage
2. Patch or crosshair: Secondary antenna for extended range in one direction

The diversity receiver automatically switches to whichever antenna has the stronger signal.

Digital Goggles

Digital goggles come with matched antennas. DJI goggles use proprietary antennas. HDZero and Walksnail goggles use standard SMA antennas that can be upgraded.

Antenna Placement Tips

• Keep antennas away from carbon fiber: Carbon fiber blocks 5.8GHz signal. Mount antennas so they’re not behind carbon plates.
• Don’t coil excess antenna wire: This creates interference patterns. Trim pigtails or route excess cleanly.
• Protect UFL connectors: They’re fragile. Use a dab of hot glue to prevent the connector from pulling loose in crashes.
• Angle matters: An omni antenna radiates best perpendicular to its axis. Mounting straight up gives best coverage when the drone is level.

Common Mistakes

1. Flying without an antenna on the VTX: Instant VTX damage. Always connect the antenna before powering on.
2. Mismatched polarization: RHCP on one end, LHCP on the other = ~50% range loss.
3. Antenna behind carbon fiber: The frame blocks the signal in that direction.
4. Damaged antenna: A bent or crushed antenna radiates poorly. Replace after crashes if the antenna looks damaged.
5. Wrong frequency antenna: Using a 2.4GHz antenna on a 5.8GHz VTX = no signal.