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Antenna Downtilt Coverage Calculator

Find where a downtilted antenna beam reaches the ground, and how much ground it covers.

Height of the antenna above the ground it is meant to cover; the other measurements are angles in degrees.

Downtilt is the angle the main beam is aimed below horizontal, including electrical and mechanical tilt. Beamwidths are the half-power (−3 dB) widths from the antenna datasheet.

Distances come from flat-ground trigonometry: a ray depressed by angle θ from height h meets the ground at h ÷ tan θ. The near and far edges use the downtilt plus and minus half the vertical beamwidth, the slant range uses h ÷ sin θ, and the path width at the aim point is twice the aim distance times tan of half the horizontal beamwidth. The model ignores earth curvature, terrain, buildings and vegetation, so it is a planning estimate for a clear site; it also ignores antenna gain patterns beyond the half-power width and RF exposure limits. Everything is worked out in your browser; nothing is sent or stored.