It seems okay the matching and radiation pattern seems clear.
First signal I heard when I just erected the mast was D4C ! by coincidence.
It does not bring more signal
That was also not claimed it should be a gain in noise and efficiency the mechanical balance point was changed 50cm to the rear compared with the DK7ZBhttp://picasaweb.google.nl/jaapoosten/LFA11Aug?authkey=Gv1sRgCPCrivvtnImiHQ&feat=directlink
DK7ZB with swallows gathering... meaning end of ES DX !