WinRFCalc Free Windows RF Calculator

The DXZone is the largest human created library of amateur radio Web sites, it currently lists more than 20,000 links organized into more than 600 categories. Since 1998, a group of radio amateurs has been reviewing new sites for listing every day and evaluating the best place to list them. The DXZone is one of the longest-running amateur radio sites still active on the Web.