@Dooooo My router is set for 6G to be Channel 69 with PSC turned on (Router interface says "When PSC (Preferred Scanning Channel) is enabled, only channels with higher connectivity will be reserved...

@Dooooo Device manager for the AXE5400 PCI-e is set to Auto for each Channel. It has options for each to set 20MHz only. Router shows: - 2.4GHz 20/40MHz, other options for 20 or 40 5GHz 20/40/80/160...

@Dooooo OK so I did some homework following your comments. I removed the antenna extension and placed the antenna on the back of the PC. Surprisingly this improved the signal. I had used those...

@woozle it's an EU verision. 2.4 Channel 8 5 & 6 GHz Auto I checked with WiFi Analyser on Windows and it showed no competing channels in the area.

I've got great connection at 2.4Ghz (30/28Mbps Down/Up)) and 5Ghz (320/67Mbps) but on 6Ghz I'm getting 143/68Mbps. Am I doing something wrong, I have OK connection I think on all networks (2.4 is...