[jagged-chisel]

If you’re using the planet as your “flat surface” then sure. If, however, you’re willing to deal with exiting the atmosphere at each end, you can use Real Straightness. But I don’t know anyone running a single segment for that distance.

[hinkley]

I’m sure there are some microwave antennas still out there doing the Lord’s Work. At least in the Plains states where hills are low and putting antennas on two of them gives you some extra distance. How far do microwaves bend over the horizon?

[aaronax]

Don't they generally do the opposite of bend over the horizon? Two towers that are observed (visible wavelength = tiny Fresnel zone) to have line-of-site can easily be obstructed (microwave = huge Fresnel zone).

https://en.wikipedia.org/wiki/Fresnel_zone

[tejtm]

> How far do microwaves bend over the horizon?

that depends on the weather and frequency among other things

https://en.wikipedia.org/wiki/Line-of-sight_propagation

[connicpu]

If you're going out of the atmosphere may as well skip the fiber and just point lasers through the vacuum of space directly and reap the benefits of the faster speed of light through a vacuum vs glass!

[scarby2]

works great until a group of space bats get in the way.