Nice article though, well spotted. Just had a skim through.
I already have an RTL SDR device and can see more uses for that sort of setup than Antenna Analysis.
Overall though I am aiming at a device for around £20. Cheap, nasty, simple and works. TBH I am only using a teensy as I had one lying around and wanted to use up the last 3.1 I had before moving on to similar with a better regulator on board.