Simple oscillator circuit used for broadcast

I introduce this circuit because I find it very elegant and easy to make.
It is from Andrew Singmin in his book: "Beginning Digital Electronics through Projects". It is one of the rare circuits that can be easily tuned to higher frequencies, that is, beyond 100 Mhz.
It also shows how easy it is to understand a "radionic broadcast" by simply replicating that idea on one´s own bench.
The circuit draws very little current, and it´s license free for that reason. You get a transmission capability from room to room from it.
I introduce the circuit for educational purpose, so that one can actually understand the idea of broadcasting, as it is often mentioned in radionics.
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