Hey! With the maximum spreading, and the stock (very poor) omni antennas in the Lilygo devices, you get this:

~ 500 - 1km: urban landscape, tons of buildings in the middle. Like opposite sides of a very crowded block.

~ 5 km: open landscape, some small hills in the middle, no good optical contact.

~ 50 / 80 km: direct optical contact, especially if CRC is disabled.