Capturing wifi traffic for fault diagnosis / usb pcap ?

[Dieselboy]

I have a wifi issue in a remote office.

I notice now that when I install Wireshark on Windows it gives me an option to install USB Pcap. With the usb pcap can I capture wifi air traffic promiscuously, if I use any USB wifi adapter? I thinking of rushing out to source a 802.11abgnac USB adapter for this purpose. I don't have a Windows laptop with an adequate on-board wifi adapter that I can capture traffic with.

Apple Mac will allow me to capture traffic but I don't have any spare.

I need to capture all traffic on the air as I suspect external interference is causing clients to have issues which is then causing roaming. After roaming, the issue comes back again causing a roam back to the original AP. These are assumptions based on the experiences and need to capture traffic to prove it.

[GeorgeS]

No, not all wifi adapters are able to, I have a raspberry pi and I had issues with an adapter I had, so i had to buy a new one, personally i went with this one:
it works in windows and raspberry. I am pretty sure there are hundreds of adapters out there and cheaper ones.

https://www.amazon.com/TP-LINK-TL-WN722N-Wireless-Adapter-External/dp/B002SZEOLG?ie=UTF8&tag=wireleshackt-20

For linux environments i know that any adapter with the following chips should work

Atheros AR9271
Ralink RT3070
Ralink RT3572
Realtek 8187L (Wireless G adapters)

[Dieselboy]

Thanks George, I know that not all wifi adapters can capture traffic.

But what about ANY usb wifi adapter, with the pcap on the usb port? https://wiki.wireshark.org/CaptureSetup/USB#USB_attached_network_interfaces