I had seen Stephen Ongs youtube video and decided to give it a try. I followed the detailed instructions at http://robotics.ong.id.au/2013/08/25/viewrf-rtl-sdr-spectrum-analyzer-for-bbb-software/ (remembering to include the "opkg install libusb-1.0-dev" mentioned in the comments) and it worked first time! I used a monitor not the LCD-7 Display ($150 if you can get them!)
I did not need to expand the file system to increase the available space to the full 8GB. When installed it only used 44% of the around 2GB available
The display (like the RTL-SDR dongle) has a bandwidth of ~2MHz but a 2GHz spectrum analyser for $65 one cannot complain
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