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wifi data rate

Hi. I use wireshark at win10 in combination with Acrylic Suite and ASUS USB-AC68. I capture air interface between router and mobile phone during iperf connection. Via iperf I can see a bandwidth of about 300Mbit/s. If I check the wireshark airtrace the <tx rate=""> max. is 156 (VHT / channel 36 / 20 MHz / MCS8 / 2 spatial streams).

Why there is this huge gap in bandwith between iperf and wireshark air-sniff? Is there any misinterpretation of wireshark? I'm using wireshark 3.4.9