Toporama
From PathlossWiki
ftp://ftp2.cits.rncan.gc.ca/pub/toporama/50k_utm_tif/
These files are in Geotiff format and can be used as a backdrop in the Pathloss program. The maps naming follows the Canadian NTS naming convention. http://maps.nrcan.gc.ca/topo_metadata/topo_click_e.php