Sorry guys, I seem to have started an argument here, it wasn't intentional. I just wanted to see how the relay switching worked but I now have that information thanks to the TW Antennas website and their manual for download.
As for copying other peoples work I am not into that, I just like the idea and feel that the Sigma vertical dipole is not very efficient on the lower bands. It is effectively a 10m dipole that is centre loaded for the lower bands. My plan is to make it bigger and resonant for 20m then use centre loading for 40m and switched capacitors to bring it to resonance on the higher bands.
You may have seen my antenna review for the G2FHF Skyranger Pro antenna in the Verticals and Wire Antennas section. This was my own development and it worked well but I have now shelved that project in favour of this one. It looks like the SR Pro was copied by Eco Antennas in Italy here http://www.ecoantenne.it/product_info.php?cPath=21_27&products_id=136
but I can't be sure. I don't mind anyway as it's a free world and it's nice to see something come of the project.