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Anyone out there with 2.4GHz experience who can help me with this helix antenna?

I tried building the by DO8PAT, but I can't seem to get a good VSWR at 2.4GHz.

I tried moving and bending some parts that I though affected the tuning, but the dip at 2.174GHz stays pretty much in the same spot.

Also any pointers to literature about these types of antennas are highly appreciated.

Original plans: qrz.com/db/DO8PAT

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