472kHz WSPR

Another disappointing 472kHz WSPR session with just 6 unique spots of my 5mW ERP in the session which started last evening and lasted until 1010z this morning.

Fewer stations are spotting me this season. Maybe the noise floor is rising and my QRP is just not getting copied so easily? Activity levels are higher than last year, so there must be a good reason. I really must have a better antenna for 472kHz WSPR TX. I know an E-field probe would be better on RX but I want to TX as there are too few active TX stations on the band. Even a few dB extra ERP would help.