Marine wifi Antenna Sighting Distance Calculator at Sea

We have created this convenient marine wifi antenna sighting distance calculator at sea that will work in Metric or Imperial measurements. It calculates the maximum distance that will be available in a point to point Wifi link from a boat antenna to an onshore antenna. Enter the height above Sea Level either in metres or feet for each antenna. Press either of the Compute buttons and the effective distance between the antennas will be displayed in both kilometers and miles. Setting one of the antenna heights to “0” gives you the effective distance from the other antenna position to the horizon it sees.

Marine Wifi Antenna Sighting Distance Calculator

Antenna Sighting Distance Calculator at Sea
Height of Boat Antenna Metres: Feet:
Height of Shore Antenna Metres: Feet:
Distance in Kms Note: This calculator does not compensates for signal loss due to the Fresnel effect. Setting one of the antenna heights to “0” gives you the effective distance from the other antenna position to the horizon
Distance in Miles The Fresnel radius shown is the extra antenna height needed at both antennas if there was no signal loss due to the fresnel effect. Full power transfer is impractical at normal distances as can be seen by the extra antenna heights needed. We therefore assume only half of the Fresnel envelope is visible, so that you should expect a 6dB power loss for this line of sight calculation.
Fresnel Radius: (meters)


Fresnel Radius Value

The Fresnel radius shown is the extra antenna height needed at both antennas if there was no signal loss due to the fresnel effect. Full power transfer is impractical at normal distances as can be seen by the extra antenna heights needed. We therefore assume only half of the Fresnel envelope is visible, so that you should expect a 6dB power loss for this line of sight calculation. Note: This calculator does not compensates for signal loss due to the Fresnel effect. Setting one of the antenna heights to “0” gives you the effective distance from the other antenna position to the horizon.

You can read more about the Fresnel Radius and use a calculator here Fresnel Radius Calcuator