This software is early alpha. I can accept no responsibility for anything it might do.

The program uses the 3 arc second SRTM data to plot a path profile, that is the height of the ground along the path from the transmitter to the receiver. You can save this data to a file for feeding into other packages.

To get it to work, put it in a directory along with the .HGT files for the region you are interested in. These .HGT files are available for download from NASA and are 1 degree tiles of the Earth between 60S and 60N. If you are interested in areas above 60N or below 60S, forget it. GTOPO30 is all that is available as far as I know. The file names represent the bottom left corner of the tile, so n50w001.hgt covers 50N-51N degrees of Latitude and 1W-0 degrees of Longitude. 

If you are in the UK, you probably want to download all the files between 50N and 60N and -10W to 2E. Each tile is just under 3Mbytes and you need 130 of them to cover the UK. This compresses down to under 200Mbytes but is still a lot of downloading, so it best to start off  with only one or two local tiles. If they are zipped, DO NOT USE WINZIP to decompress them without first checking you have disabled the "smart" CR/LF substitution. Each file should be exactly 2,884,802 bytes.