Your issue might be because that adapter is old and doesn't support 802.11ac from the looks of it. You'll want to have a 3-stream 802.11ac adapter to make sure your able to actually decode all frames, otherwise, you'll just see management frames instead of data. You'll want something better like this: https://www.amazon.com/gp/product/B01GE9QS0G/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B01GE9QS0G&linkCode=as2&tag=metageek06-20&linkId=7730939e1d77615ea58482ae9c3c34ea Easiest thing is to use a recent edition of a MacBook Pro laptop to do captures with. Have a look here to help you get going some, keep in mind this i just the tip of an iceberg: https://www.cwnp.com/nola-ppt-pdfs/WedPresentations/Jay%20Savvius%20-%20Packet%20Capture%20and%20Analysis%20in%20the%20MU-MIMO%2011ac%20World.pdf https://www.cisco.com/c/en/us/support/docs/wireless-mobility/80211/200527-Fundamentals-of-802-11-Wireless-Sniffing.html
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