[modern] Missing Aerial

I have a 94 XJ40 3.2S.

At the centre top of the rear windscreen, there’s a small square of plastic
with a small aerial attached. Or rather there was. The aerial has

Can anyone tell me what this aerial is for, and how much it would cost to
replace it (it looks like another one can just be screwed into place.)



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Probably a cell phone antenna.