How to see 802.11ac with npcap/radiotap

[false via Wireshark-users <wireshark-users () wireshark org>]

Hello,
Been fighting with this on how to see 802.11ac header info (modulation, etc). I can't find much info and I'm also 
unclear as to radiotap and npcap integration. 
1) What is the process to see 802.11ac headers?2) I have npcap  0;.99-r5 installed and Wireshark  2.6.0
Any help is very much appreciated.
Thank you,Jay

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