This doesn't do anything useful. To detect RF transmissions you need to sweep a range of frequencies stopping at each frequency for a period of time for the Rx amp to sample. The AnalogDevices detector that is uses needs to be programmed, and the arduino code doesn't do that. It doesn't have the bandwidth or performance to do any real scanning. There's a reason why spectrum analyzers cost thousands (or tens of thousands) of dollars.
Its funny watch Arduino (ease) programmers try to figure out RF (very hard).
Its funny watch Arduino (ease) programmers try to figure out RF (very hard).