Receiver: finding a good location
One of the most important points is the view. The best view is a free horizont in all direction. In most cases you have buildings or mountains blocking the horizont. You can simulate the receiver coverage with several Tools.
One good tool is radio mobile. You can also use (and select "up in the air")

Following parameters were used to make the simulation:

Antenna Height: 10m
Mobile Antenna Height: 500m Frequency: 902MHz
Maximum Range: 300km
Base Antenna Gain 9.0dB
Tx Power 0.01W
Rx Line Loss: 0.5dB
Rx Threshold: 0.1mV

Not mentioned parameters had the default parameter.

The comparison of the OGN coverage tool show that the simulation is quite good.
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