Discussion
A base station antenna is raised from 15 m to 30 m. What gain does the two ray model predict?
Answer: C
Received power varies as the square of the height, so doubling it gives a factor of four:
\[ 10\log_{10} 4 \approx 6 \]
that is 6 dB. The same six decibels would follow from doubling the mobile's height, which is rarely possible. Height gain of this kind is why the first few tens of metres of mast are so valuable and why site acquisition dominates the cost of a cellular network.
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