Radio wave propagation

Hello and welcome. My name is John Loftus. I enjoy conducting research into radio wave propagation and operate a radio station with callsign VK4CT

photo showing a large element 40m radio antenna, located on top of a ridge at 420m above sea level.
Three element 40m radio antenna on top of a ridge heading to North America

The radio station is licensed by the Australian Communications Media Authority (ACMA) to operate non-commercial radio communication apparatus. The location is 23Km inland from the East coast of Queensland Australia, Grid locator QG62JV. Sitting on top of a ridge 420m above sea level, the line of site views over Moreton Bay towards North America are magnificent. Station operation is shared with Bernd VK2IA.

Queensland is well suited to radio wave propagation – particularly toward North America, Asia and Europe on both short and long great-circle paths. During the lows of the 11 year sunspot cycle, Queensland has an advantage with weak signal reception – compared with southern states of Australia. This advantage is evident in data collected by and the Reverse Beacon Network (RBN). As sunspots increase through the 11 year cycle, the Queensland advantage falls away.

Researching radio wave propagation

My focus is scientific research into radio wave propagation and innovative communication systems – put to the test in international contests.

My research interests contribute to:

Data collected by the RBN is freely available to the public and organisations for study and analysis at

Similarly, data collected by is freely available to the public and organisations for study and analysis.

Comprehensive data analysis is presented by Phil at

With this experience, I find more than one way to use WSPR analysis and the RBN to continuously improve radio station equipment and antennas.