Bought RTL-SDR v4 for around 200 RMB.
Yes, Airspy Mini can work with a signal of around 600 MHz.
Buy an Airspy R2 or another series for around 1000 RMB.
I want to buy Hack RF for around 3000 yuan.
Additionally, the antenna and its location are also very important; the antenna should not be of poor quality.
The background noise in the city center is essentially constant hum. Even in rural areas, a shortwave radio like the UVK6 can pick up signals easily.
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