Here is a static map (as of May 8, 2013) showing geographic locations of some of the plots which have been generated by Splat! (Map courtesy of ECU Cartography Department - Thanks!)

Splat Web Interface

Splat! is a program which utilizes terrain data (from Space Shuttle missions) to create plots for determining coverage areas provided by various antenna configurations, or to analyze the radio path between two locations. Splat! is of particular interest to the Amateur Radio Community. This web page provides a web interface to the splat! program.
73 de Bill W5GFE, w5gfe at arrl dot net
I would like to identify other websites who would be willing to also host a Splat! web interface like the one on this site. Please check out the "download" section below. I would provide a link on this site to those other sites. If you are interested in becoming a Splat! website, please drop me a line: w5gfe at arrl dot net
There are seven items of interest on this page:

World wide terrain data is now available, but "city" and "political boundary" data is available only for North America at this time

We need some information in order to create plots or profiles for you.
You need to know that we will "file" the geographical information that you provide so that it appears on plots generated by other users, as well as by you. This will ultimately result in a "ham station" map of the area, but your station's geographic location will be disclosed to anyone who uses these pages to create plots or profiles.


In order to use the Splat! software you must first "register" your station location by following the
Registration Link
You will need to know your latitude, longitude, and the height of your antenna.
Here is a list of Registered Stations
Here are the last 30 Log Book entries and Activity Graphs
If you create plots involving more than one station, each station must be registered.

Registration involves providing only geographic information. No email address is collected. Please see the Caveat.

Coverage Plots

Coverage plots involve only your own station, and provide a (rather large) PNG image that uses various colors to show expected signal strength on a map that contains your QTH. The terrain data is depicted on a gray-scale map, using data from space shuttle missions. The data includes HAAT calculations.
Follow This Link for Coverage Plots.

Profile of Paths Between Two Stations

These plots use geographic data for two stations to produce profiles of the paths between those two stations. If the two stations are separated by long distances (say Texas to Connecticut) you may get some really funny answers. Two stations may lie in different states so long as the physical separation is not too great.
Follow This Link for path profiles.

Multiple Transmitter Plots

These plots take a long time (up to six or seven minutes!) to create. Multiple transmitter sites are combined to illustrate the total coverage possible.
Follow This Link for Multiple Transmitter path profiles.

How to Download This Website for your own use

You can download splat! itself, as well as the components of this web site for your own local use. You will need: Check out the
Site for further directions


All credit for splat! belongs to John Magliacane KD2BD. I encourage you to visit his site and enjoy his talents! 73 de Bill, W5GFE w5gfe at arrl dot net
Thanks also to Walter, K1CMF, for pointing out an error (mine) in the Longley-Rice profiles!
w5gfe at arrl dot net
Last modified: Thu Jun 2 21:55:14 CDT 2011