DJI O4 Relay field placement signal safety guide

DJI O4 Relay Field Placement Guide: 2 m Crop Clearance, Antennas & Signal Safety

September 17, 2026

The relay's field position directly affects signal transmission. DJI's user guide gives four practical constraints: height above crops, unobstructed antennas, thunderstorm avoidance and operating temperature.

Quick Answer: Set up the O4 Relay at least 2 m higher than the crops, keep its antennas unobstructed, do not set it up outdoors during thunderstorms, and operate it from 0°C to 45°C (32°F to 113°F).

DJI O4 Relay field setup height antennas weather and temperature — Field-positioning rules derived directly from DJI's English Usage section.

Place the relay at least 2 m above the crops

DJI recommends positioning the relay at least two meters higher than the crop canopy to support signal transmission. Treat this as a field-placement requirement, not simply an optional mounting preference.

DJI O4 Relay elevated on extension rod above signal path — The manual illustration shows the relay elevated on its mount/extension rod with a clear signal path.

Keep all antennas unobstructed

Do not obstruct the antennas during use. If an antenna is damaged, the verified replacement path is the DJI Agras T100 OEM O4 Relay Antenna (Pair).

Do not deploy outdoors during thunderstorms

DJI explicitly warns against setting up the relay outdoors during thunderstorms because of lightning-strike risk.

Operating temperature

The product should be used from 0°C to 45°C. DJI warns that high temperatures can create fire or explosion risk and low temperatures can negatively affect battery performance.

Battery temperature after field operation

Do not charge the internal battery immediately after use. Let it cool to near room temperature first. The specified charging range is covered in the battery-care article.

Use the DJI O4 Relay Signal Repeater System together with verified antennas and a stable field mounting solution appropriate to the installation.