I need Wi-Fi for my car, which is parked in the underground car park.
My basement is exactly behind the car park where my car is, but behind a concrete wall.
To test it, I bought and installed the older version of this Devolo series. However, it was a bit too weak, so the Wi-Fi was only visible briefly and sporadically in the car.
Is this version with "WiFi 6" better than the old version?

Old product: https://www.digitec.ch/de/s1/product/devolo-magic-1-wifi-mini-starter-kit-1200-mbits-powerline-11890294?supplier=406802

Thank you for the tips.

Question

I need Wi-Fi for my car, which is parked in the underground car park.
My basement is exactly behind the car park where my car is, but behind a concrete wall.
To test it, I bought and installed the older version of this Devolo series. However, it was a bit too weak, so the Wi-Fi was only visible briefly and sporadically in the car. 
Is this version with "WiFi 6" better than the old version?

Old product: https://www.digitec.ch/de/s1/product/devolo-magic-1-wifi-mini-starter-kit-1200-mbits-powerline-11890294?supplier=406802

Thank you for the tips.

Answer

Unless the car also has WiFi 6, it shouldn't do any good. Something with more/larger antennas is more likely to help. WiFi 6 is faster, there are fewer conflicts with neighbouring networks and many devices at the same time run cleanly in parallel.

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