nRF52840-CKAA-R(WLCSP-94) Frequency generate internally or externally

The components in the reference are the minimum required:  schematic, https://infocenter.nordicsemi.com/topic/ps_nrf52840/ref_circuitry.html#concept_k2r_5q2_2cb

The antenna comes in addition to this. 

The antenna comes in addition to this for greater distance detection?

If we are not using external antenna then could we still connect nRF52840-CKAA-R(WLCSP-94) bluetooth to the other mobile or any device for the shorter distance communication?

Thank you

We have observed below trace which is onboard antenna?

What we have understood is right?

Please refer below snapshot

Thank you

Well, if you don't need to use the radio, you don't need the antenna. Else, you will indeed need the antenna. 

I suggest you look for a module, that will make it easier for you to get started: https://www.nordicsemi.com/Nordic-Partners/3rd-party-modules

Yes, this is what you need.