A transmitting antenna at the top of a tower has a height of 20m and the height of receiving antenna is 45m. Calculate the distance between them for satisfactory communication in LOS mode.
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The maximum line-of-sight distance dM between two antennas having heights hT and hR above the earth is given by dM=2RhT−−−−−√+2RhR−−−−−√ where hT and hR are the heights of the transmitting and receiving antennae.
Substituing, we get: dM=2×64×105×32−−−−−−−−−−−−−−√+2 times64×105×50−−−−−−−−−−−−−−−−−√m
dM=64×10210−−√+8×103×10−−√m
=144×102×10−−√m=45.5km
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