# FPV Drone Antenna Selection Guide: RHCP vs LHCP, Patch vs Omni, and Optimal Placement
Signal quality is everything in FPV. You can have the best VTX, a top-tier camera, and premium goggles — but if your antennas are mismatched, you’ll see breakup where others see clear sky. This guide breaks down FPV antenna types, polarization, gain patterns, and placement strategies to maximize your video link quality and range.
## Circular vs Linear Polarization
FPV almost exclusively uses circularly polarized (CP) antennas. Here’s why:
| Polarization | Signal Retention | Multipathing Rejection | Common Use Case |
|—|—|—|—|
| Linear | Poor (signal fades with orientation mismatch) | None (bounces corrupt signal) | Micro whoops (weight savings) |
| RHCP (Right-Hand Circular) | Excellent | High (rejects opposite polarization) | Standard FPV — 95% of pilots |
| LHCP (Left-Hand Circular) | Excellent | High (rejects opposite polarization) | Niche / anti-interference setups |
**Critical Rule**: Match polarization across your entire system. RHCP on the quad = RHCP on your goggles. Mixing RHCP with LHCP causes 20-30 dB of signal loss — equivalent to reducing your VTX power by 99%.
## Antenna Types and Radiation Patterns
### Omnidirectional Antennas
Omni antennas radiate evenly in a donut-shaped pattern. They’re your primary choice for freestyle, racing, and general flying where the quad is constantly changing orientation.
| Antenna Style | Beamwidth | Gain (dBi) | Best For |
|—|—|—|—|
| Pagoda / Cloverleaf | 360° horizontal, ~80° vertical | 1.5-2.5 dBi | Racing, proximity freestyle |
| Lollipop (AXII-style) | 360° horizontal, ~75° vertical | 1.6-2.0 dBi | Compact builds, durability |
| Singularity | 360° horizontal, ~90° vertical | 1.8-2.2 dBi | Wide vertical coverage |
### Directional (Patch) Antennas
Patch antennas focus gain in one direction. Use them on your goggle module (paired with an omni) for diversity reception.
| Antenna Style | Beamwidth | Gain (dBi) | Best For |
|—|—|—|—|
| Standard Patch | ~120° | 5-8 dBi | Mid-range, general flying |
| Helical | ~40-60° | 9-14 dBi | Long-range, fixed direction |
| Crosshair / Pepperbox | ~80-110° | 7-11 dBi | Long-range with wider beam |
## The Diversity Setup: One Omni + One Directional
Most modern FPV goggles support dual-receiver diversity. The optimal configuration:
1. **Antenna 1 (Omni)**: A quality RHCP lollipop or pagoda — covers you when flying behind yourself
2. **Antenna 2 (Directional)**: A patch or crosshair — extends range in front of you
The diversity module automatically switches to the stronger signal. This gives you both close-in coverage and forward range.
## Quad Antenna Placement
| Position | Signal Quality | Durability | Notes |
|—|—|—|—|
| Rear vertical (SMA straight up) | Excellent | Moderate (crash risk) | Best all-around; clear of carbon frame |
| Rear horizontal (SMA out the back) | Good | Good | Better crash survival; slightly directional rearward |
| Top-mount (TPU mount) | Excellent | Low (highest point in crash) | Optimal for long-range |
| Direct SMA on VTX (no pigtail) | Poor | Poor | Avoid — transmits through carbon and stresses SMA connector |
**Non-Negotiable Rules:**
– Always use an SMA pigtail — never mount the antenna directly to the VTX
– Keep the active element away from carbon fiber (carbon absorbs RF)
– Secure the antenna with zip ties or TPU; a loose antenna in flight causes VSWR spikes that can burn out your VTX
## Connector Types
| Connector | Diameter | Use Case | Notes |
|—|—|—|—|
| SMA | 6.3 mm (threaded outer) | Full-size antennas | Most durable; standard on 5″ builds |
| RP-SMA | 6.3 mm (threaded inner) | Legacy / some VTX | Pin-reversed; don’t mix with SMA |
| U.FL / IPEX | 1.0-1.5 mm (snap-on) | Micro VTX (Whoops/Toothpicks) | Fragile; secure with glue or tape |
| MMCX | 2.4 mm (snap-on) | Mid-size VTX | More durable than U.FL; rotational freedom |
## Recommended Antenna Setup
For a reliable, no-compromise antenna setup, the **Foxeer Lollipop 4 Plus (RHCP)** paired with a **TrueRC X-AIR patch** is the gold standard. Both are available at [uavmodel.com](https://uavmodel.com) along with premium SMA pigtails in 50mm, 80mm, and 120mm lengths to fit any frame.