Thomas Borchert writes:

When I wrote "onboard radar" I was thinking about good old primary
radar. You know why? Context. The average layman has no idea about the
workings of TCAS.

It appears that the average layman isn't the only one afflicted by
ignorance.

He's thinking about that big antenna in the nose of the airplane.

Very few lay people have any belief that there is a big antenna
anywhere in an aircraft.

That is what they think detects traffic. And that is
strictly for weather (and ground).

Antennas can serve many purposes, and in many locations.

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