added a useful link

[rafalfitt]

https://www.duckware.com/tech/wifi-in-the-us.html

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[codecov[bot]]

Codecov Report

Merging #400 (c2644cd) into feature (971db79) will increase coverage by 0.08%. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feature #400 +/- ## ============================================= + Coverage 92.14% 92.22% +0.08% + Complexity 899 898 -1 ============================================= Files 130 130 Lines 2685 2687 +2 Branches 233 235 +2 ============================================= + Hits 2474 2478 +4 Misses 63 63 + Partials 148 146 -2 ```