I have bougt the EVB Board and the Box (https://www.olimex.com/Products/IoT/ESP32/BOX-ESP32-EVB-EA/)
On the picture, there is an externa antenna attached to the board.
I can not find any connection point for the antenna.
On Ebay a saw a oicture of an "ESP32-POE-ISO" board,(... itm/204206354696)
with en exnernal antenna socket. Cant find it on your website.
There are antenna variants in the ESP32-EVB web-page, ESP32-EVB-EA or ESP32-EVB-IND-EA, there is radio button to select the variant (located above the price):
https://www.olimex.com/Products/IoT/ESP32/ESP32-EVB/open-source-hardware
There are also direct links below with each of the products selected:
https://www.olimex.com/Products/IoT/ESP32/ESP32-EVB-EA/open-source-hardware
https://www.olimex.com/Products/IoT/ESP32/ESP32-EVB-EA-IND/open-source-hardware