Interesting homework. This was done in real life for eavesdropping bluetooth connections (I remember seeing a live demo in a security conference): https://www.rtl-sdr.com/spying-keyboard-presses-software-defined-radio/
Last year Milos Prvulovic, a computer science researcher uploaded some videos to YouTube showing how he was able to remotely and covertly record the keystrokes of a target laptop in another room wirelessly using just a software defined radio, magnetic loop antenna and some custom software. The target laptop was first modified with special driver...