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Comsats are generally in LEO. A higher LEO than spy sats, perhaps, but well within the range of anti-satellite systems.

Comsats are generally in GEO.

Would it be possible to build a comsat network in LEO for reduced latency, kind of like the Synapse network in Antitrust?

There are several comsat constellations in LEO. The most famous one is Iridium's.