Hello

Tune it for maximum noise or signal on the frequency. You should hear
the motor noise on your receiver as the capacitor turns. Then fine
tune it back and forth.

Right, just tune for max. noise or signal, please notice that some loop,s
are
very sharp and have a very small bandwidth. And if you can hear the motor
turning the capacitor, then return the antenna to the manufacture and tell
him to design his products properly.

Regards Max