So sorry, the after upgrade the TX power set to 1000mW that is why I got better results.
sorry for reviving this old topic, but FYI, this was fixed last year with https://git.openwrt.org/?p=openwrt/openwrt.git;f=package/kernel/mac80211/patches/ath9k/580-ath9k_ar9561_fix_bias_level.patch;h=e4c2e1cd02cf0f1247b52b3f599e62942df4db0d and upstreamed at https://patchwork.kernel.org/project/linux-wireless/patch/20220417145145.1847-1-hacks+kernel@slashdirt.org/
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