A computer can be turned into a software defined radio and used to inspect the radiofrequency spectrum.
To Do and Notice
Download and install the software.
Plug in the USB dongle and attach the antenna.
Run the software and inspect the radiofrequency spectrum
What's Going On?
A radiofrequency receiver designed to decode television frequencies can be used to detect and analyze radiofrequencies over a broad band.
Once you have the receiver operating, you can use it to detect location signals from Aircraft via their automatic position reporting transmissions known as ADSB at 1.090 GHz.
You can also track ships on their automatic position reporting system known as AIS at 162.025 MHz and 161.975 MHz
Scientific Explorations by Paul Doherty
17 May 2014