What is the optimal position of ESP-WROOM-32 on base board ?

[SaiTejaManchukanti]

Hello, Currently we are developing ESP-WROOM-32 based board for our application.

Page 15 in hardware design guidelines suggests recommended position of ESP-WROOM-32. Can someone please explain the reason behind recommended and not recommended position ?

Link for the hardware design guidelines is provided below.
https://www.espressif.com/sites/default ... nes_en.pdf

[WiFive]

antenna performance

[SaiTejaManchukanti]

Please explain what is the difference between position 1 and position 3.
Why position 1 is not recommended and position 3 is highly recommended ?

[BuddyCasino]

Look at the antenna feed points, the two bright spots on the black antenna part. In Pos 3 & 4, they are at the edge of the board, in all others they are in the middle of the PCB.