https://hackaday.com/2021/07/05/diy-air-quality-sensor/

@Mishka Very nice work indeed. One question though: I don't see an antenna of any kind built into the PCB. Maybe I'm just not seeing it, or is there none? I do see a connection for an off-board near field antenna, but off-hand I don't see where the antenna is for 2.4Ghz RF. Oh, I see it now. You're using a chip antenna. Got it. Well, now that you've been using it for a while, how is the Raybeacon working out for you?