PCB Schematic Question: Is it necessary to include the antenna for the bluetooth IC? (Making my own Arduino Nano clone)
As per section 1.5.2: in the NINA W102 data sheet:

“The NINA-W102 modules use an integrated antenna mounted on the PCB. The PCB outline is 10.0 x 14.0 mm. The RF signal pin is not connected to any signal path.”

Further down in the pin table it is noted than pin 13 is only used on 101 modules without the internal antenna. Therefore you should not connect an external antenna.