Receiver: finding a good location
One of the most important points is the view. The best view is a free horizontally in all directions. In most cases you have buildings or mountains blocking the horizon. 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.

You can quickly check how much coverage there is in an area using either of the coverage maps OGN coverage map (beta) or OGN coverage tool . These tools allow you to choose different parameters to display but 'lowest altitude AGL' and 'expected gap' give a good indication of how good the existing local coverage is. Signal strengths are less predictive due to variable quality of aircraft installations and transmit power differences. Having many receivers in an area improves reliability and coverage closer to the ground.

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