The CHDB Yagi antenna is a compact directional transmitting Yagi antenna from the Ukrainian manufacturer CHDB (Cherkasydronbud) for the TX transmitter module in UAV, NRK, and MIL ELRS radio control systems. It increases the range and stability of the control channel compared to omnidirectional solutions at the same frequency.

Common parameters for the series: gain 10 dBi, VSWR < 1.2, impedance 50 Ohm, linear polarization, weight approximately 120 g (depending on the variant and mounting). Includes a 50 cm coaxial cable with an SMA (male) connector.

On the Flash Army website, each MHz sub-band is a separate product. Choose the variant for your TX frequency (see tables below). In the product card's name and characteristics, specify the band, for example: CHDB Yagi Antenna 370–400, Yagi 420–480, etc.

Key Features

• Type: Yagi, directional antenna for TX.
• Gain 10 dBi, impedance 50 Ohm.
• VSWR < 1.2 in the operating band of the selected variant.
• Polarization: linear.
• Cable 50 cm, connector SMA (male).
• Factory settings for 310–790 MHz bands (catalog below).
• Compact dimensions — convenient mounting on the remote control and external TX module.

Key Advantages

• High gain 10 dBi: significantly better range compared to dipole/Moxon at the same frequency.
• Low VSWR < 1.2: efficient TX power transmission without unnecessary losses.
• Ready 50 cm feeder: connection to TX without homemade cables.
• Lightweight design (~120 g): convenient for field control points.
• CHDB in-house production: compatibility with 370–550 MHz transmitters, MIL ELRS, and TX+RX kits.
• Wide range of frequencies: from 310–330 to 730–790 MHz for a specific radio link.

Areas of Application

• Ground TX transmitter on the control panel or external module.
• MIL ELRS systems and CHDB radio links in the corresponding sub-band.
• CHDB TX+RX kits (TX antenna replacement or upgrade).
• Long-range FPV flights and reconnaissance missions.
• Field posts where a directional antenna is needed instead of the standard omnidirectional one.

Available Frequency Options (Separate Products)

Each row is a separate product card on Flash Army. The exact range and SKU should be clarified with the CHDB supplier.

Dimensions and Weight by Variant

For most sub-bands — compact design, weight around 120 g. Detailed dimensions are provided by the manufacturer for specific items:

Note: the CHDB catalog also includes a large ground Yagi 310–330 (other specs: 7.3 dBi, 640×440 mm) — a separate product, see chdb-antena-yagi-310-330.html.

Package Contents

• Yagi antenna (variant for the selected frequency).
• 50 cm coaxial cable with SMA (male) connector.

Technical Specifications (Common for the Series)

Operating Warnings

• Choose the variant strictly for your TX frequency — an unsuitable sub-band increases VSWR and reduces range.
• Orient the Yagi towards the UAV's flight area; you may need to rotate the antenna if the operator's position changes.
• Tighten the SMA without misalignment; do not strain the cable during installation.
• Keep the antenna away from metal structures that distort the radiation pattern.
• Do not confuse the compact Yagi 10 dBi with the large Yagi 310–330 (7.3 dBi) — these are different catalog items.

The CHDB Yagi antenna is a compact ground solution for Sub-GHz control: 10 dBi, VSWR < 1.2, and a choice of eight sub-bands for your CHDB radio link.

Other products in this category can be found in the Yagi Antennas for Military section.