Discussion
How does the two ray model depend on antenna heights?
Answer: B
In the fourth power regime the received power is proportional to the product of the squares of the two heights, so doubling either height gains six decibels. That is why base station masts and rooftop antennas are worth their cost. Height matters far beyond simply achieving line of sight, since it also increases the path difference between the two rays. A model that makes a design variable enter as a square identifies immediately where effort is best spent.
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