472kHz WSPR RX overnight with preamp

Overnight, I used the FT817 on MF RX with a preamp and the (short) earth-electrode antenna in the garden. Subjectively, the sensitivity is better and I am able to copy stations at better strength. I will do a straight comparison of sensitivity, with and without the preamp, using a signal generator later.

These are the unique station spots given to others overnight. Many stations were copied many times of course:

Unique 472kHz WSPR stations copied overnight