ScanDiego.com

If you've ever wanted to have a nice graphical program to show line of sight, coverage, calculate path values, etc, etc, you can get one free at this website:

http://www.cplus.org/rmw/english1.html

Program name is Radio Mobile, and the website shows you where to get full, free, downloadable digital elevation data to use with the program.

You can visualize the areas your site has line of sight to, show a visual path elevation from point a to point b, and just about anything else you might want to do, for determining radio path viability.

Haven't been able to find anything free like this for Mac.

Natl. Geo.'s Topo! is supposed to do the job, for a few bucks.

Here's a DTV signal locator with distance between you and the tower, beam heading, and layman's explanations.

http://tvfool.com/index.php?option=com_ ... &Itemid=29