More on my problem:
another Image: https://forum.openwrt.org/t/5ghz-low-performance-on-tp-link-archer-c6-v2/73107/67?u=ashr123
root@OpenWrt:~$ cat /etc/config/wireless
config wifi-device 'radio0'
option type 'mac80211'
option path 'pci0000:00/0000:00:00.0'
option channel '36'
option band '5g'
option htmode 'VHT80'
option country 'IL'
option cell_density '0'
config wifi-iface 'default_radio0'
option device 'radio0'
option network 'lan'
option mode 'ap'
option ssid 'Roy&Karin'
option encryption 'sae-mixed'
option key 'EngineeringPoyke'
option wpa_disable_eapol_key_retries '1'
config wifi-device 'radio1'
option type 'mac80211'
option path 'platform/ahb/18100000.wmac'
option channel '1'
option band '2g'
option htmode 'HT40'
option country 'IL'
option cell_density '0'
config wifi-iface 'default_radio1'
option device 'radio1'
option network 'lan'
option mode 'ap'
option ssid 'RoyAndKarin'
option encryption 'sae-mixed'
option key 'EngineeringPoyke'
option wpa_disable_eapol_key_retries '1'
royash@Roys-MBP ~ % /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I
agrCtlRSSI: -35
agrExtRSSI: 0
agrCtlNoise: -92
agrExtNoise: 0
state: running
op mode: station
lastTxRate: 780
maxRate: 867
lastAssocStatus: 0
802.11 auth: open
link auth: wpa3-sae
BSSID:
SSID: Roy&Karin
MCS: 9
guardInterval: 800
NSS: 2
channel: 36,80
My ISP gives me 300 Mbps download and 30 Mbps upload.
In addition, when I choose in openwrt the frequency to be on auto mode, the network doesn't appear on my raspberry pi 4.
Is there any way to improve the download speed?