Well, what a bloody muppet!
AC6LA has informed me that, as impressively built as the ADS-B antenna is, its wrong. It seems that what ive built isnt a beta match (hairpin), but a gamma match! This might go some way to explaining why im still not picking up any signals!
After a fair bit of head scratching and looking at lots of drawings online, admittedly mostly of VHF hairpins on beam antennas, I think I know how its done!
Time will tell. I think though, that I will also build a simple wire colinear, just in case!
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