This program uses a free XML feed from the HamQTH.com website of Petr, OK2CQR. His callsign database has over 1.3 million callsigns and is very fast, returning the station information in just a few seconds. Thanks to Petr for a great service. Given a ham radio callsign, twHamQTH will display the name, address, city and country of the station. All of the station data can be use by other programs. You'll need a free HamQTH.com login to use this software.