Where to find information about the built in antenna for the nRF54L15DK

Hello,

i recently received several nRF54L15DK kits. 

The example good for channel sounding works well but left us with a question about the BLE antenna.

According to the product page, there is a built in antenna but no specific information is given.

Since we are planning on running some tests, we want to know every variable.

Is the built in antenna a pcb antenna (trace next to connector)?

Is an external antenna required for accuracy?

We read somewhere the external antenna allows for spectral analysis but we are unclear if it should also be used for normal use.

Is there a page i missed where more information is given about these things?

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