PDF details:
HAMweather, LLC
Upload the "RSS.pm" (RSS.php in PHP) file to the hamlib/HW4 directory. Note that you may need to create the "HW4" subdirectory with in the "hamlib" directory.
http://www.hamweather.com/hw3/docs/hw3php/plugins/HW3_RSS_php/HW3_RSS_php.pdf
