I built a same circuit and it was fun, My circuit works with 40V and 1A and I think this ciruit with 2Mhz and 40W power is like transmiters circuits , This is the reason that I asked this question dear Triode.
I tested my circuit with a transistor radio the pizoelecteric works with 1.7MHz and it is at the end of MW band, Unfotrunatly I could hear the noise of my circuit from radio about 5 meters around it!