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Tracking these balloons is a lot of fun and a challenge, because the transmitter on the balloon is only 25 milliwatts. That's not a lot less power than your wireless router. However the transmitter operates on HF frequencies so using a good antenna and being lucky with propagation allows you to receive the signal.
It helps to have a rotator for your antenna so you can point it toward where you think the balloon will be, having DSP functions on your receiver help you discard the noise and receive the very weak signal.
Using a computer attached to your radio allows you to decode the data being transmitted and pinpoint the location.
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