Understanding FPV Antennas – Tips for Better Reception

The Ultimate FPV Antenna Guide by Antennenfreund

Reliable video transmission is essential when flying FPV. Whether you're racing through tight obstacles, trying out new freestyle tricks, or covering longer distances with a long-range model, the right antenna can make a significant difference.

But which FPV antenna is right for your system? What do RHCP and LHCP mean? Is more antenna gain always better? And why does video interference sometimes occur even when your model is only a few metres away?

In our guide, we'll explain the most important fundamentals, highlight common sources of interference, and help you find the right antenna for your FPV setup.

1. Why Choosing the Right FPV Antenna Is So Important

When flying FPV, both video signals and control commands need to be transmitted reliably. This usually involves two independent radio links:

• Video link: Transmits the camera feed from the aircraft to your FPV goggles or monitor. The 5.8 GHz frequency band is commonly used for this purpose.

• Control link: Transmits control commands from the radio transmitter to the aircraft. Common systems operate at 2.4 GHz and, depending on the system and region, 868 or 900 MHz.

Both links have different requirements when it comes to antennas, frequencies and range.

Especially with video transmission, unfavourable antenna positioning, obstacles, reflections or unsuitable connectors can cause problems.

A good FPV antenna is therefore not defined by range alone. What really matters is how reliably it transmits the signal under actual flight conditions.

2. Antenna Gain (dBi) – Why More Isn't Always Better

Antenna gain is usually specified in dBi. This value describes how strongly an antenna concentrates its signal in a particular direction compared to a theoretical isotropic radiator.

There is one important principle to understand:

An antenna does not generate additional transmission power. It simply distributes the available energy differently throughout space.

FPV antennas can generally be divided into two main categories.

Omnidirectional Antennas – Flexible for Racing and Freestyle

Omnidirectional antennas cover the area around their antenna axis.

Their radiation pattern often resembles a doughnut: the signal is strongest to the sides of the antenna, while weaker areas can occur along the antenna axis, depending on the design.

These antennas are particularly suitable for flying styles involving frequent changes in direction and orientation.

Typical applications:

• FPV racing

• Freestyle

• Flights in changing directions

• General FPV flying at short and medium distances

Directional Antennas – Focused Signal Distribution for Longer Distances

Directional antennas concentrate their energy more strongly in a specific direction.

This can provide better reception within the main radiation area. However, reception performance decreases outside this area.

Typical directional antennas include patch and helical antennas.

They are particularly suitable for long-range flights or routes where the aircraft remains predominantly within a known area.

Our tip: Don't focus solely on the highest dBi rating when buying an antenna. For an agile FPV racer, an antenna with a broad and consistent radiation pattern may be the better choice.

3. RHCP, LHCP and Linear Polarisation Explained

Polarisation describes the orientation or movement of the electric field of a radio wave.

In FPV systems, linear and circular polarisation are particularly important.

Linear Polarisation

Linearly polarised antennas have a fixed polarisation plane.

Typical examples include simple dipole and whip antennas.

They are lightweight, compact and relatively simple in design. However, reception can deteriorate significantly if the transmitting and receiving antennas are not aligned in the same orientation.

This can be a disadvantage, especially when an FPV aircraft frequently changes its orientation during flight.

Circular Polarisation

With circularly polarised antennas, the direction of the electric field rotates as the wave propagates.

This makes the radio link less sensitive to certain changes in orientation between the transmitting and receiving antennas.

Another advantage is the potential suppression of unwanted multipath propagation, for example reflections from buildings, metal surfaces or other obstacles.

This is why circularly polarised antennas are widely used in FPV video systems.

What Do RHCP and LHCP Mean?

There are two directions of rotation for circularly polarised antennas:

• RHCP (Right-Hand Circular Polarisation): Right-hand circular polarisation

• LHCP (Left-Hand Circular Polarisation): Left-hand circular polarisation

For optimal performance, the transmitting and receiving antennas should use the same circular polarisation.

RHCP should be paired with RHCP. LHCP should be paired with LHCP.

Combining RHCP and LHCP can result in significant signal losses.

Such a connection may still work over short distances, but it is not recommended for reliable FPV operation.

Important for digital systems: Always check the manufacturer's specifications before replacing an antenna. Some systems use multiple antennas or specific antenna configurations.

Why Is Polarisation Important When Signals Reflect?

When a circularly polarised radio wave is reflected, its direction of rotation can reverse.

A correctly polarised receiving antenna can partially suppress these reflected signals.

Under suitable conditions, this reduces unwanted multipath effects and can improve video transmission.

When several pilots are flying together, deliberately assigning RHCP and LHCP can also help reduce mutual interference. Proper channel planning is still essential, however.

4. Our Double-Quad Antennas – Developed for FPV Flying

At Antennenfreund, we have been involved in the development and handcrafted production of FPV antennas for more than ten years.

Our specially developed circularly polarised Double-Quad design is at the heart of our work.

The idea behind it originated from a simple question:

How can we develop an FPV antenna that not only offers good antenna gain but also maintains the most consistent radiation pattern possible when the aircraft changes orientation?

Especially in FPV racing, an aircraft is constantly tilted, rotated and accelerated. An unfavourable radiation pattern can lead to significant fluctuations in reception performance.

Our Double-Quad antennas were developed with the goal of combining broad, consistent radiation characteristics with efficient signal transmission.

What Makes Our Double-Quad Antennas Special?

• Special antenna geometry designed for FPV applications

• Circularly polarised versions available in RHCP and LHCP

• Handcrafted construction instead of anonymous mass production

• Different versions for transmitting and receiving equipment

• Various connector options and designs

• Robust versions for demanding flight conditions

Our Double-Quad Propfräse, for example, is specifically designed for use on FPV racing drones. We also offer receiving antennas for FPV goggles, as well as versions for various analogue and digital systems.

The most suitable option always depends on the device, polarisation and intended application.

5. What Types of FPV Antennas Are Available?

Double Quad

Our Double-Quad antennas combine a specialised radiation pattern with circular polarisation.

Depending on the version, they are suitable for mounting on the aircraft or FPV goggles.

They are particularly interesting for FPV pilots who value consistent signal coverage during changes in flight orientation.

Double Quad Propfräse

The Propfräse is a version of our Double-Quad design specifically adapted for practical FPV applications.

It was developed primarily for racing and freestyle, where a durable antenna with a suitable radiation pattern is essential.

Cloverleaf and Skew-Planar

These classic FPV antennas use several curved radiating elements and are widely available in circularly polarised versions.

Their actual performance depends on factors such as manufacturing quality and precise geometry.

Patch Antennas

Patch antennas are flat directional antennas.

They provide a focused reception area and are frequently used on FPV goggles or ground stations.

They are particularly useful when the aircraft mainly flies in a specific direction.

Helical Antennas

Helical antennas use a spiral-shaped radiating structure.

Depending on their design, they can achieve high directional gain and consequently have a narrower reception area.

They can be a good choice for longer distances but require careful alignment.

Wing Antennas

With fixed-wing aircraft, aerodynamics, installation position and shielding by the fuselage play an important role.

Special antenna designs that can be integrated as flatly as possible are therefore particularly suitable.

6. TX and RX – Which Antenna Goes Where?

In the FPV world, you'll frequently come across the abbreviations TX and RX.

TX – The Transmitting Antenna on the Aircraft

TX stands for Transmitter.

The video transmitting antenna is connected to the video transmitter (VTX) or the corresponding transmitting unit of the FPV system.

When choosing an antenna, pay particular attention to the following characteristics:

• Low weight

• Durable and protected mounting

• Suitable radiation pattern during changes in flight orientation

• Correct polarisation

• Compatible connector type and frequency range

Warning: Never operate an active video transmitter without a suitable connected antenna or the RF termination specified by the manufacturer. A severe impedance mismatch can damage the transmitter's output stage.

RX – The Receiving Antenna on the FPV Goggles

RX stands for Receiver.

The goal here is to receive the signals from the aircraft as reliably as possible.

Omnidirectional antennas are often suitable for general FPV applications. Directional antennas can offer advantages when flying within a specific sector.

Diversity – Combining Two Antennas Effectively

Many FPV receivers feature multiple antenna connectors.

With a conventional diversity receiver, the system can select between different received signals.

A proven combination is:

• Omnidirectional antenna: Covers a wide area around the pilot.

• Patch antenna: Improves reception within the specifically targeted area.

Using two omnidirectional antennas can also make sense, particularly when they are positioned so that both are not shielded at the same time.

Digital multi-antenna systems may have different requirements. Always follow the manufacturer's recommendations.

7. SMA, RP-SMA, MMCX and U.FL – Finding the Right Connector

Even a technically excellent antenna is of little use if its connector does not match your equipment.

FPV systems use several different connector types that are easy to confuse.

SMA and RP-SMA

SMA and RP-SMA connectors look very similar from the outside.

The main difference lies in the design of the centre contact.

With SMA connectors, the Male and Female designations refer to the outer connector construction, not just the centre contact.

Important: SMA and RP-SMA connectors should never be confused. Incompatible combinations can result in no electrical contact or damaged connectors.

Before purchasing, always check both the thread and the centre contact.

MMCX

MMCX is a compact high-frequency connector with a snap-on mechanism.

It is used in various FPV transmitting units and requires less space than a conventional SMA connection.

U.FL / IPEX

U.FL is an especially small connector that can be mounted directly onto a circuit board.

Similar designations such as IPEX are commonly used in the FPV world. It is important to check the exact connector series, as not every miniature RF connector is compatible with every other type.

These connectors are delicate and should be carefully connected and disconnected, preferably in a straight motion.

Pigtails and Antenna Extension Cables

A pigtail is a short coaxial cable that connects, for example, a connector on a circuit board to an external antenna.

At high frequencies, every cable introduces additional signal attenuation.

Therefore:

Use short, high-quality cables wherever possible and avoid unnecessary adapter connections.

However, a properly sized pigtail can be useful for secure installation and may even be preferable to putting mechanical strain directly on an antenna connector.

8. How to Install FPV Antennas Correctly

Correct installation has a significant impact on actual reception performance.

Even a good antenna can lose a considerable amount of its effectiveness if installed in an unfavourable position.

Install the Antenna in an Unobstructed Position

Carbon frames, batteries, metal components and other conductive materials can affect radiation characteristics.

Whenever possible, position the antenna so that it is not directly shielded by larger components.

Protect Antenna Connectors

During a crash, considerable forces can act on the antenna mounting.

Flexible mounts, suitable TPU holders or short pigtails can help reduce mechanical stress on sensitive connectors.

Consider the Radiation Direction

Omnidirectional antennas do not radiate equally strongly in every direction.

Reception can be particularly weak along the antenna axis.

The mounting position should therefore be chosen to suit the typical flight orientation and the pilot's position.

Position Multiple Antennas Carefully

If your system uses multiple antennas, follow the manufacturer's recommended orientation.

Separating the antennas spatially can help reduce the risk of simultaneous signal obstruction.

Check Your Antenna After a Crash

After a hard impact, inspect the following:

• Antenna housing and radiating elements

• Cables and potential kinks

• SMA, MMCX or U.FL connections

• Mounting and alignment

Even minor damage can reduce antenna performance.

9. Identifying and Fixing FPV Video Interference

Not every video disturbance automatically means that the antenna is faulty.

In many cases, the cause is related to installation, a connector, the power supply or external interference.

The Image Gets Worse as I Fly Further Away

Possible causes include an unfavourable antenna position, obstacles, incorrect polarisation or a damaged connector.

First, check the line of sight, antenna installation and technical settings of your system.

I Experience More Video Dropouts in Forests

Vegetation can significantly attenuate radio waves in the 5.8 GHz range.

Wet foliage in particular, as well as multiple obstacles between the aircraft and the pilot, can make transmission more difficult.

Try to maintain the clearest possible signal path and reduce the distance if necessary.

The Image Is Only Good in a Certain Direction

A misaligned directional antenna or shielding on the aircraft may be responsible.

Check the antenna orientation and the position of the battery, frame and other components.

I Experience Interference as Soon as the Motors Start

Electrical interference can originate from ESCs, the power supply or unfavourable cable routing.

Check the wiring, connectors, power supply and, if necessary, the filtering of your video system.

The Image Gets Worse When Multiple Pilots Are Flying

Possible causes include overlapping channels, different transmission power levels and insufficient frequency separation.

Coordinated channel planning and appropriate polarisation choices can help reduce interference.

My Signal Is Still Poor Despite Installing a New Antenna

Check the following systematically:

1. Are the frequency range and system compatibility correct?

2. Do the RHCP and LHCP configurations match?

3. Is the connector actually compatible?

4. Is the antenna undamaged?

5. Is the signal being shielded by carbon, the battery or other obstacles?

6. Are the cables and adapters in good condition?

7. Are other transmitters or electrical components causing interference?

If possible, test a replacement antenna that is known to work correctly. This is often a quick way to identify a faulty antenna.

10. Which FPV Antenna Is Right for Your Flying Style?

The right antenna depends on your video system, aircraft and preferred flying style.

FPV Racing and Freestyle

In racing and freestyle, the aircraft rarely remains stationary in the air.

Fast turns, rolls and constantly changing flight directions require an antenna that can operate reliably under these conditions.

Well-matched omnidirectional antennas are particularly interesting for these applications.

Long Range

At longer distances, the entire radio link plays a crucial role.

In addition to an efficient transmitting antenna, a correctly aligned directional antenna on the receiving side can offer advantages.

Also pay attention to a clear radio path and compliance with permitted transmission power levels and frequencies.

Digital FPV

Digital FPV systems such as DJI O3/O4, Walksnail Avatar and HDZero may use different antenna connectors and configurations.

The antenna selection must therefore match the specific device.

Not every 5.8 GHz antenna is suitable for every digital system simply because it operates at the same frequency.

11. Frequently Asked Questions About FPV Antennas

Which Is Better: RHCP or LHCP?

Neither polarisation is inherently better than the other.

What matters is that the transmitting and receiving antennas match and that the respective system configuration supports them.

Do I Need the Same Antenna on My Aircraft and Goggles?

No. Different antenna designs can be combined effectively.

For example, an omnidirectional antenna on the aircraft can be used together with a patch antenna on the goggles.

However, the frequency range and polarisation must match.

Does More dBi Automatically Mean More Range?

Not necessarily.

Higher antenna gain is accompanied by increased directivity.

Whether this actually provides an advantage depends on the flight direction, antenna position and surrounding conditions.

Can I Connect an SMA Antenna to an RP-SMA Connector?

Not without a suitable adapter.

Although the threads are similar, the centre contacts are different.

Can a Damaged Antenna Cause Video Interference?

Yes. Damaged radiating elements, cables or connectors can affect impedance matching and signal transmission.

Can a Better Antenna Help Me Fly Through Buildings or Trees?

A suitable antenna can improve the radio link, but it cannot overcome physical limitations.

Solid obstacles and dense vegetation can still attenuate the signal significantly.

12. FPV Antennas by Antennenfreund – Handcrafted with Experience

An FPV antenna is more than just a piece of wire attached to a video transmitter.

Its geometry, materials, workmanship and tuning all play a significant role in determining how reliably it performs in real-world conditions.

At Antennenfreund, we have been developing and manufacturing specialised FPV antennas for more than ten years.

Our Double-Quad designs were developed with the ambition of combining consistent radiation characteristics with reliable video transmission.

Our range includes different versions for analogue and digital FPV systems, from compact racing drones to long-range aircraft.

Not sure which antenna is right for your FPV goggles or video transmitter?

We're happy to help you find the right solution. Simply tell us which system you use, which polarisation you need and what type of antenna connector your equipment has.

Because the best antenna is not necessarily the most expensive one or the one with the highest gain. It is the antenna that best matches your setup.

Discover our handcrafted FPV antennas and find the perfect solution for your next flight.