472kHz WSPR RX

472kHz WSPR RX this evening without preamp

All evening (since about 2000z) I have been active on 472kHz (20% TX 5mW ERP, 80% RX) using the earth-electrodes without a preamp. All the usual suspects were copied. Since 2240z I have gone onto 100% RX with the preamp in circuit to see if I am able to detect  weaker signals and give better reports. On previous nights it was hard to draw conclusions.