An online network of KiwiSDR radios enables you to pinpoint the location of stations using Time Difference of Arrival (TDoA) direction finding techniques.
The KiwiSDR is a US$299 HF SDR that can monitor the entire 0 - 30 MHz band at once. It is designed to be web-based and shared, meaning that the KiwiSDR owner, or anyone that they've given access, can tune and listen to it via a web browser over the internet.
Many public KiwiSDRs can be found and browsed from the list at sdr.hu
This looks to be a great resource for SWL's.
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