AGW Packet Engine
PC with soundcard and a source of Packet radio I used http://websdr.suws.org.uk/ on 144.8 FM.
Virtual cable to redirect sounds in PC
Friday, 22 February 2013
Here's a picture of what I got for £15 on ebay at the end of 2012. Superb for vhf and uhf bands. I have used it with plane plotter linked with rtl1080. You can see the planes moving on a map realtime! and listen to the pilots on nfm.
I have also decoded some local pager traffic and listened to FM commercial radio stations and the london buses not to mention some local baby monitors on 50 Mhz fm.
All free software sdr# even has versions that scan the airwaves.