Capture 802.11 traffic on my Wired Network

I'm trying to capture all or any 802.11 traffic on my wired network. I simply am trying to ensure if anyone attaches a wireless device to a PC, on my wired network, I can capture and display when it happened and if possible the host or MAC PC so I can track down the user via his or her PC. I tested a capture using wireshark and inserted a wireless USB Network Card on a PC. After installing the wireless card and enabled it, then connected to a guest wireless network but I have not seen any 820.11 packets on the small network while in promiscuous mode. The PC I'm using to capture data and the PC that had the wireless USB card inserted are two different PCs but on the same subnet.

Can anyone tell me how to setup a capture for my entire network when any 802.11 network activity occurs? I've read the various types of 802.11 communication types, example; 00 Management 1000 Beacon wlan.fc.type_subtype == 0x08

A million thanks