Ok, I just now finished V-Stun Quick Spider.
SWR = 1.23
Placed about 30cm besides FA antenna & connected to dongle /Pi for 10 minutes. Seems good, much better than standard 1/4 wave spider. Cant say with surety how good, as traffic is very low at this hour.
The white core insulation piece at top, and an extra short piece of wire in it is for sliding up/down to adjust length of upper wire and consequently adjust the SWR.
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