Also, be aware that the terrain database that is used has an effective approximate resolution of ~30 meters by 30 meters (1/3 arc-second) per pixel if high res data is available or, if not, the effective resolution is only ~100 meters by 100 meters (1 arc-second). Therefore, for locations that are either on extremely sloped locations or are extremely close to them, the data available to the simulator are too coarse to be expected to have any expectation of accuracy.
It all will boil down to your getting an antenna up on the roof and seeing wha't actually in the air there.
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