An SDR receiver that catches everything at frequencies of 241700MHz is built on the RTL2832U and R820T2 chips. Detailed setup instructions with SDRSharp.
Buy SDR receiver on aliexpress: http://ali.pub/43vdpg
MCX to SMA adapter: http://ali.pub/44lb73
Download SDRSharp: https://airspy.com/download/

Using such a USB receiver with aliexpress, you can make a radio scanner and listen to everything that happens on the air in the range from 24 MHz to 1.7 GHz. For example, you can listen to the talks of ham radio, truckers, city services, railway and taxi dispatchers, walkietalkie builders and much more.
The video showed in detail the installation of drivers and the configuration of the SDRSharp program for working with the receiver. You can also listen to my local hams and railway workers. In addition to the one shown in the video, with the help of this SDR receiver, I was able to listen to the negotiations between the fire controllers and accept the negotiations between the airfield controller and the pilot.
The receiver is built on the basis of the R820T2 TV tuner and the RTL2832U digital demodulator.
Using additional software, you can take photos from satellites, decode digital walkietalkies and even track the parameters of civil aviation with ADSB technology.
In addition, aliexpress there are other SDR receivers with different characteristics and at different prices, but this one turned out to be the cheapest of those that really work.

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