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by daddylonglegs 2848 days ago
There are microwave links across Europe:

https://sniperinmahwah.wordpress.com/2016/01/26/hft-in-the-b...

There are apparently shortwave links across the Atlantic:

https://sniperinmahwah.wordpress.com/2018/05/07/shortwave-tr...

https://sniperinmahwah.wordpress.com/2018/07/16/shortwave-tr...

These should have a lower latency than fibre links although the shortwave link will probably have rather a low data rate.