CHDB UAV/UGV Radio Control System TX+Yagi+RX+Spiral RX 150 MHz — a kit for remote control of UAVs and UGVs in the enhanced 150–153 MHz band using the MIL ELRS protocol. The TX + Yagi + RX + Spiral RX configuration combines a directional Yagi antenna on the transmitter for maximum communication range and a compact spiral dipole antenna on the receiver with a drone frame mount.

Maximum reported range — up to 43 km (reconnaissance aircraft, according to the manufacturer). Transmitter output power 0.9–1.2 W, Backpack function allows switching video channels from the remote control without additional on-board manipulations. The solution was developed by the Ukrainian manufacturer CHDB (CherkasyDroneBud) for operation in conditions of high radio activity and limited air visibility.

The kit includes a TX V3.3 150 MIL ELRS transmitter, an RX Mk4 150 MIL ELRS receiver, a Yagi 150 transmitter antenna, a RX 150 spiral receiver antenna with a plastic frame mount, heat shrink tubing, and soldering wires. Installation is minimal: soldering the receiver, installing the mount and antenna on the drone, connecting the TX module to the remote control with the Yagi antenna.

Key Features

• Radio control of UAVs and unmanned ground vehicles at 150 MHz.
• MIL ELRS protocol with FHSS support (on receiver).
• Enhanced operating range 150–153 MHz.
• Backpack — switching video channels from the control remote.
• Directional Yagi antenna on TX: gain 6–8 dBi.
• Spiral antenna on RX with mount for frame attachment.
• Firmware update via Wi‑Fi (transmitter).

Key Advantages

• Range: up to 43 km reported range with Yagi + spiral RX kit (reconnaissance aircraft).
• Sub-GHz 150 MHz: better signal penetration compared to 2.4 GHz in complex terrain and interference conditions.
• Directional Yagi on TX: beam angle 60° (horiz.) / 65° (vert.), collapsible design 104×108 cm.
• Compact RX: module dimensions 20×30×6 mm, power 5 V.
• CHDB in-house production: adaptation to the needs of the Defense Forces, manufacturer's service and consultation.
• Quick re-equipment: soldering 4 contacts on the drone board — minimal integration time.
• Ready kit: TX, RX, antennas, mounts, heat shrink tubing, and wires in one delivery.

Areas of Application

• Long-range FPV and reconnaissance UAVs.
• Unmanned ground vehicles (UGVs) in EW zones.
• Tactical observation and engagement with remote control.
• Missions where control channel stability at low frequencies is critical.
• Field and mobile teams with a ground Yagi antenna at the control point.

Configuration (TX + Yagi + RX + Spiral RX)

• CHDB Transmitter TX V3.3 150 MIL ELRS (Backpack).
• CHDB Receiver RX Mk4 150 MIL ELRS.
• Transmitter antenna Yagi 150 (directional, 6–8 dBi).
• Receiver antenna spiral dipole RX 150 with plastic frame mount.
• Heat shrink tubing, soldering wires.

Technical Specifications

Operation Warnings

• Install the RX 150 spiral dipole antenna only in vertical polarization — otherwise, the range and communication stability will sharply decrease.
• Orient the Yagi antenna on the transmitter towards the target (drone flight zone); when the ground station changes course, direction correction may be required.
• Adhere to the TX power range of 6.5–24 V — exceeding the voltage may damage the module.
• Before the first flight, check TX/RX binding and Backpack settings in the MIL ELRS firmware.
• Do not bend or damage the cable from RX to the antenna (IPEX) — use the mount and mast from the kit.

The CHDB TX+RX 150 MHz system (configuration TX + Yagi + RX + Spiral RX) — a ready-made solution for long-range control of UAVs and UGVs at 150 MHz: the combination of a directional ground antenna, a compact on-board receiver, and military MIL ELRS firmware provides a stable control channel where range and interference immunity are critical.

Other products in this category can be found in the section Ground Stations and Repeaters for FPV Drones.