That's pretty bad. Cue the video of him measuring 50 Ohms for that small scribbled line...
I jumped on the project as soon as I saw it and will be thinking about a solution myself.
It might reduce the obstacles for getting more kids into science and engineering.
For the real stuff, I am not so sure...
They did some experiments with HF antennas like for WiFi or cellular and it didn't work so well but I think there is a HF limit with it that FM should fall far below.
As far as usage in teaching circuits, it wouldn't be very useful after the first class. The bulk of learning about circuits is math.
The resistance will not be an issue either for signal traces. Only those receiving or delivering power such as Vcc or the output of an audio amp or cable drivers.
I'm looking to enhance it with software for another KS project WaterColorBot, a very low cost plotter. With that, multi-line overlapping traces can be created to lower resistance and it could even automatically implement their suggestion of rubbing over a dried trace with something hard to compress the colloidal silver in it into making better contact between particles.
