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Comment Re:What about saturation? (Score 1) 177

Traditional wifi uses omni-directional antennas that propagate in spheres (roughly). If you want to see a good example, turn on a few light bulbs, and notice how they all overlap in coverage. Fifteen light bulbs will have a *lot* of overlap, and you'll start stepping on each other. 2.4GHz wifi is particularly bad this way, due to neighboring channels overlapping.

Directional antennas propagate in cones (roughly, again). A good example of this is a flashlight. You can turn on a whole lot of flashlights before you start seeing the same amount of overlapping. The downside is that it's hard to light up a room with a flashlight, so you have to start doing a lot of tricks to move a portable device around but maintain a connection.

I can't really explain RF propagation with a car analogy, so you'll have to settle for flashlights and light bulbs.

Comment Re:Combat situation (Score 1) 104

As an American soldier, I'll come out and say that I'd rather the Taliban shot the robot than the real medic. View these like bomb-disposal robots: they're not intended to be better at the actual task (inspecting a bomb or dragging a casualty) than a human, they're intended to do these tasks in situations where you'd hesitate to risk a human. Or, given that most medics I've known will take the risk anyway, at least give the human another option.

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