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The problem with digital is that it needs a hell of a good signal to get a good BER and it's wide band. You're better off with narrow band signals which makes FM a better choice, or if you have a good yagi try for amateur radio beacons on 144 MHz. I used to get pings from VK4RTT about 800km away on good mornings with a 12 el yagi. I'm a bit out of date but a lot of the Ham guys used to do whisper or similar every morning also via meteor scatter.
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