Thanks for the reply Steve, that was quick.
I don't have an analyser unfortunately. My radio wont TX out of band.
I made the balun exactly as per your website, same coax same toroids.
same connections, same windings. it looked just like yours. and its wired
in the right way round. tuning has been done in the dry at about 10 ft in the clear
although there is a tin garage roof about 7 ft below it and to one side.
On 20 I start with an swr of a bit above 5-1 then with shortening ,(I originally cut the wires longer)
the swr drops to approx 4.5-1, then starts to rise again, its quite lively on RX. using your measurements,
what are the distances between the dipole ends on your antenna ?. would this make much of a difference ?.
the other 4 bands came down to less than 2-1 quite easily although the
bandwidths are not too wide, I only have about 18 ft of coax on it for tuning
and I expect it to get wider when I put it in situ with about 80ft of coax (RG8xx mini
it will end up at about 28ft high.