Facebook might be useful for something. I noticed a post from Mark Jessop, VK5QI, to say that there was a High Altitude Balloon (HAB) heading towards Melbourne from near Adelaide so I thought I'd have a go at receiving the telemetry on 70cm with my vertical. The signal is on 434.199 Upper Side Band, 25mW.
The decode software was downloaded via here and I was happy to get a few decodes.
If you upload your position will show you on the map.
The balloon is about 230km from me and the signal is very weak but I do get decodes from time to time. Great stuff!
There's a video about this fascinating work here: