The controller of the modified DJI Smart Controller/RC PRO can be equipped with an external ALIENTECH antenna.
DJI RC Pro Smart Controller (CP.MA.00000406.02)
Amazon.com: BoxWave Cable Compatible with DJI Smart Controller - DirectSync - USB 3.0 A to USB 3.1 Type C, USB C Charge and Sync Cable for DJI Smart Controller - 6ft - Black : Electronics
DJI Smart Controller HDMI and USB Cap Dust Protector - Etsy
DJI Matrice 300 RTK Enterprise Smart Controller
Kiplyki Wholesale USB HDMI & Type-C Interface Plug For DJI Smart Controller Mavic 2 - Walmart.com
Everything You Need to Know About the DJI Smart Controller | Full Review - YouTube
DJI RM500 Smart Controller for Mavic 2 Pro/Zoom/Air 2/2S Mini 2/Phantom 4 Pro – ASA College: Florida
DJI Mini 3 Pro w/ DJI RC Smart Controller - Drone-Works