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Satellites orbit the earth at about 22,000 miles up in space. It would be difficult to figure out the "line of sight distance" from the satellite up in space to a dish somewher in the USA because the earth is curved. You can estimate though. For a perfectly true south satellite, Figure out the distance from a dish's truesouth to the equator. Then incorporate 22,000 miles into whatever distance measurement you use. Then use a^2+b^2=c^2 to figure out approx the line of sight distance.
I can't even imagine a dish 90 degree elevation being able to receive any satellite. Unless the satellite's beam can be perfectly vertica which i doubtl!!
For the best signals from a satellite, you have to take a look at a satellite's footprint in lyngsat.com and see where the max amount of power is output.
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