Last weekend the Wireless Institute of Australia held its annual convention at Hahndorf, just outside Adelaide.
A major event on the Sunday was the 'Come and Try Radio Day' at the local football oval.
This was a cooperative event organised by Adelaide's amateur radio clubs.
Numerous radio activities were on show including a near-space balloon launch (and tracking), microwave (gigahertz) communication, amateur television, home construction, antennas and more.
If radio and electronic geekery appeals, you might enjoy this video.