Antenna Radiation Pattern Visualizer
Our antenna radiation pattern visualizer shows where your antenna actually sends its signal. Pick a dipole, inverted V, vertical or Yagi, choose the band and height, and watch the 3D pattern change. As a result, you can see why the same wire works for local nets at one height and reaches Europe at another.
📡 Your Antenna
🌐 3D Radiation Pattern
🗻 Side View (Elevation)
🧭 Top View (Azimuth)
Reading an Antenna Radiation Pattern
The 3D shape is the antenna radiation pattern. A bigger, redder lobe means a stronger signal in that direction. The side view shows the takeoff angle, which is how high above the horizon the strongest signal leaves. In general, low angles travel farthest, while high angles come back down close to home.
Why Height Matters So Much
A horizontal antenna works together with its reflection in the ground. At about a quarter wavelength high, most of the signal goes straight up, which is ideal for statewide nets. At a half wavelength or more, the main lobe drops toward the horizon for long-distance contacts. Try 40 meters at 30 feet and then at 70 feet to see the difference.
About the Calculations
The patterns use standard textbook formulas for each antenna over a simple model of the ground. Real antennas also feel nearby trees, buildings and feed lines, so treat the numbers as a good guide rather than an exact measurement. For detailed modeling, hams use free programs such as EZNEC and 4nec2.