Something like this: https://www.seeedstudio.com/RF-Explorer-model-WSUB1G-p-922.html https://www.seeedstudio.com/RF-Explorer-model-WSUB1G-p-922.h... ... along

Something like this: https://www.seeedstudio.com/RF-Explorer-model-WSUB1G-p-922.html https://www.seeedstudio.com/RF-Explorer-model-WSUB1G-p-922.h... ... along with a high dB external attenuator because it is designed for low power. According to the docs a 60dB external allows for 1 milliWatt to 2 Watt measureable input. I think the default power for 2.4ghz Wifi is 100mW.