Longley Rice Online tool: http://lrcov.crc.ca/cov.php?lang=en I also use Radio Mobile by VE2DBE: http://www.cplus.org/rmw/english1.html They do agree with each other. I use radio mobile professionally to do path studies, STL links, and to figure out azimuths for some of our remote broadcasts. You can make some great maps of your coverage. -- Don Russell, CBRE W9DRR ARRL OES, Technical Specialist Winnebago County AEC http://www.socialengineer.us --