Amazon.com: Waveshare Compute Module 4 Antenna Kit Certified for Use with Raspberry Pi Compute Module 4 Supports 2.4G/5G WiFi Frequency Band : Electronics
Raspberry Pi Compute Module 4 Antenna Kit : ID 4793 : $5.00 : Adafruit Industries, Unique & fun DIY electronics and kits
Enable the external antenna connector on the Raspberry Pi Compute Module 4 | Jeff Geerling
Raspberry Pi 4 Model B with External WiFi Antenna Connector (U.FL) | eBay
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Raspberry Pi 4 Model B with External WiFi Antenna Connector (U.FL) | eBay