It is crystal controlled, or can be driven by any external variable frequency oscillator (v.f.o.). Built-in antenna tuner ... to build your own tube-based AM transmitter, you might want to ...

Engineer David Maxson will present a session at the NAB Show titled “Proving the HEBA Antenna,” Monday April 7.

We can say one thing for [bitluni]: the BOMs for his projects, like this ESP32 AM radio transmitter ... ether using a short stub of wire for an antenna. The range is severely limited, but ...