I struggle with this like tparvais.
I’ve tested an ESP32CAM module with a pigtail and different antennas. It was better by 10db.
I’m also waiting for this to arrive: link
And I will let you know the results when it’s tested. It’s clearly for testing as I can by 3 ESP32CAM for the price of this.
I’m currently testing this board (given by Olimex)
And the first results seems very promising. I’m getting data from a mi flora outside, with the gateway inside with a wall and a window between both. The gateway is 9 meters away from the Mi Flora.