[Catbert59]

I've tested LoRa from Hill<->Hill and Flat Land<->Flat Land and 30-60km worked with plenty of SNR left.

On 868MHz with standard 5dBi omnis.

Thesis: as long you are using one of the more robust LoRa settings it always will work as long you have LoS or at least only lightly obstructed LoS.

[bdjdndb]

If you have line of sight, a simple flashlight would work for communication

A robust communication needs to work in valleys

[Catbert59]

Blinking a flashlight 1200 times per second is a bit exhausting.