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Just cut / remove the pcb as visible on the photo.
Also note that I've removed a little bit of soldermask on the end of the pcb antenna and the groundplane close to it.
Don't forget to solder the ground trace/bridge on the left side.
CC2531 USB Adapter Antenna mod
How to correctly add an SMA Antenna to your ZigBee Sniffer / Gateway Adapter for increased range
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I don't quite follow. Is this what you do? https://www.screencast.com/t/sJM3PLoIa
Are you sure? yes | no
What exactly do you mean by "solder the ground trace/bridge on the left side"? Are you talking about this little spot I highlighted where you also removed some solder mask? https://imgur.com/a/nb9MIR8
Are you sure? yes | no