Calculate Point-to-Point Wireless Links
At least 60% of this zone must be free of obstacles (trees, buildings) for a stable connection.
When setting up a long-distance wireless network (like bridging a Wi-Fi signal between two buildings), simply having a visual "Line of Sight" (LoS) is not enough. Radio waves don't travel in a straight, laser-thin line; they expand into an elliptical, cigar-shaped area between the two antennas. This area is known as the Fresnel Zone.
If objects like trees, hills, or buildings intrude into this elliptical zone, the radio signals hit them, bounce off, and arrive at the receiving antenna out of phase. This causes destructive interference, drastically reducing your signal strength and bandwidth. Network engineers mathematically calculate the maximum radius of the 1st Fresnel Zone (which occurs exactly at the midpoint of the link). As an industry rule of thumb, at least 60% of this radius must remain completely clear of physical obstructions to maintain a stable, high-speed connection. Use this calculator to ensure your antenna masts are mounted high enough!
AI-generated estimates. No guarantee of accuracy. We assume no liability for decisions based on these results. Independent verification is recommended.