I was playing around with the FFT block in GRC and the next thing I know it's snowing outside and I’ve made myself a vhf airband scanner but without it having to do the scanning. I never knew you could probe four thousand channels all at once!
Here is a screenshot of my latest creation which is currently configured for an i7 running the latest GNU Radio & UHD master code, an Ettus USRP2, WBX and GPSDO: