Radio Signal Coverage Map, 0 to 3000 MHz

Enter your locator or click your position on the map, then set the frequency, the transmitter power, the antenna gain in dBi and its height above ground. The map colours every point around the transmitter by the chance of a reliable link. Add a receiver to get the full link budget. Below 30 MHz the tool models the ionosphere; above 30 MHz it reads the real terrain profile in every direction.

From 30 kHz to 3000 MHz: long and medium waves with the ground wave, the whole HF range with the ionosphere (MUF, absorption, day and night), and VHF, UHF and SHF with the terrain, the curvature of the Earth, diffraction and the surrounding environment. The model switches automatically when you change the frequency.

On level ground the limit is the radio horizon, about 4.1 times the square root of the antenna height in metres, for each antenna. Terrain can reduce it a lot or, from a hilltop, extend it. The map shows the real result for your location. See radio horizon and antenna height.

From elevation tiles stored on this site, built from SRTM data of NASA and USGS (public domain). Your browser reads them from our own server: no third-party service is involved in the calculation. The precision (about 600 m down to about 75 m per point) can be chosen in the tool.

It is the estimated probability that a station at that spot can copy you at that time: it combines the chance that the path is open (on HF, that the frequency is below the MUF) with the chance that the signal is above the noise by the margin your mode needs. 50% means the median case just works; 90% or more means a dependable path.

Yes, on every band. On HF a horizontal antenna reflects off the ground and its height sets the take-off angle at which it radiates best. On VHF, UHF and SHF the height sets the radio horizon and how much terrain blocks the path. Change the height and watch the map change.

Wide analogue modes such as broadcast FM and AM need the most, SSB and narrow FM less, CW less still, and digital weak-signal modes like FT8, WSPR and LoRa work far below the noise. Switch the mode and the whole map updates.

It is a transparent, simplified model made to compare antennas, heights, frequencies and sites, and to learn. It does not see buildings and trees (it adds an environment loss), nor sporadic-E, ducting or scatter. Treat the numbers as medians with a statistical spread and read the limits and the methodology.

No. All the calculation runs in your browser and your position is never uploaded. The page only downloads map tiles and the elevation tiles around your transmitter.