I have been interested in this stuff since I saw a presentation on SDR by the folks at Ettus Research (and their amazing SDR setup). I eventually bought a HackRF One from Greatscott Gadgets to play with and it, like the BladeRF can cover a lot of ground with a pretty wide chunk (its only 20Mhz bandwidth generally but this has not been a limitation so far). So far I've been looking at beacons and other iOT type things, and decoding the remote control to my ceiling fan (fun). Very fun stuff to look at the spectrum and see what is there.