Tips for Planning Long Wireless Links
The longer a wireless link, the more important it is to properly design and plan the link so that it will provide you with reliable performance. The following sections provide some reminders to help you plan longer, reliable wireless links. Consider your links that are longer than about 7 miles (11 km) to be long links.
Antenna Height
As you know, the earth is curved. The distance to the radio horizon is 7.75 miles (12.5 km) for an antenna that is mounted 30 ft (9 m) above the ground, assuming a k-factor of 4/3.
Longer link distances require that you mount your antennas higher above the ground to extend your radio horizon. You can calculate the distance in miles to the radio horizon by multiplying 1.415 times ...
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