Experimental tool Calculations include terrain, Earth curvature, refraction and the first Fresnel zone. Field verification remains essential.

RF planning for real terrain

See what lies between two antennas.

Choose two points on the map or enter their GPS coordinates. The profile applies the effective Earth radius to the terrain and shows how much of the Fresnel zone remains clear.

OpenStreetMap Earth k-factor Fresnel 60% EU868 / custom
Path map
133,5 km
Drag the markers or use the “Pick on map” buttons.
RF
Path result Ready for analysis

Press “Calculate path” to generate the corrected profile.

Distance—geodesic
Maximum bulge—k = 4/3
Maximum Fresnel—first zone
60% clearance—critical point
FSPL—without obstacles
Estimated margin—without diffraction/fading

Longitudinal profile

Terrain, ray and Fresnel

Corrected terrain Direct ray 60% Fresnel
The profile will appear here with Earth curvature applied to the terrain

How to read the result

Green is not a promise. It means favourable geometry.

01

Corrected terrain

Each DEM point is raised by the Earth bulge for the selected factor k .

02

Fresnel 60%

A robust link needs clearance around the ray, not merely a clear thin line.

03

Link budget

The displayed margin is idealised; vegetation, actual cables, polarisation and fading can reduce it.