Antenna
Site
feetmeters
Distance up on tower
Ground elev. at tower
Avg. coverage elevation
RF
Gain/Loss at base of antenna
Enter values or Load Defaults.
Side view, not 1:1 — horizontal and vertical scales differ (see axis ticks in feet). Terrain slope between tower and coverage area is drawn for illustration; the math assumes the receiver is at the average coverage elevation.
Results
| Point | Distance | Elev. angle | Net path loss | RX (FSPL only) | Pattern | RX (FSPL + pattern) |
|---|
"FSPL only" assumes full antenna gain at every point. "FSPL + pattern" applies the estimated vertical pattern at that elevation angle. Path loss is shown as negative dB.
Calculations
About
Web rebuild of a VB.NET program by Bill Hershey, AE7YS. Free-space path loss model; terrain obstruction, ground reflection and multipath are not modeled. Antenna presets are typical estimates, not real models; check the manufacturer's pattern data for real antennas.