Issue from zero/zero3/README

[RadxaYuntian]

说明天线接口是U.FL

[tangzz-radxa]

Thanks for the report. Confirmed that the ZERO 3W external antenna holder uses a U.FL (IPEX MHF1) connector — verified against the ZERO 3W BOM (WiFi antenna socket, 3x2.6x1.25mm RF 1st-gen SMD).

Opened PR #2016 to clarify this in the RF Antenna page (zh + en).