I was reading about how high speed investment traders were planning on using microwave transmitters and stationary balloons over the Atlantic to gain microseconds on their competitors who were using satellites for communications. In their business where time is literally money it was expected they could recoup the cost of building in network in a couple of years.
I have always been in favor of the project using ballons/blimps as communications relays so that might be an option for using microwaves.
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