IWR1443BOOST: anntenna design explanation

Part Number: IWR1443BOOST

Hi,

I was wondering how you decided on the designs for IWR1443BOOST and IWR1642BOOST. I understand the advantage of 1443 over 1642 is elevation possibility, but why is this not in 1642?

Can you give me some pros and cons on this design choice please?

cheers,

J.