As a last attempt (for now) on 474.2kHz WSPR this evening I have strapped the feeders of the Par 10/20/40, the 2m halo and the V2000 tri-band VHF/UHF vertical all together and am tuning it against mains ground to see how things compare with previous tests. The "theory" is the effective vertical is about 2x higher so, if efficiency was about the same as before, the ERP would be up. In reality, the antenna current is only 10% higher so losses over the "short" Marconi must be much greater.
So far, spots of other stations appear stronger (e.g.G3XIZ -1dB S/N) but I've only managed 2 spots of my own signal, these from PA3ABK/2 in Holland at 306km. These are not brilliant, but similar to the earlier tests. More results overnight tonight.
Tomorrow I may go back to 10m.