Tuning capacitors go here. The ic socket makes it easy to add more to select the frequency.
I'm using a signal generator, simply coupling it to the antenna with a wire wrapped around the antenna. Watching on the scope the line from the antenna I look for the biggest signal while varying the signal generator output.
The current setup resonates best at 22.05kHz. That should be good for GQD in Skelton, UK which is at 22.10Hz.
The next step is to get the Gyrator 3 board operational. Here I've made the final connections.