A better picture would help. Seems like your ground plane is tiny compared to the radiating part. And its hard to see but it looks like your ground plane is parallel to you radiating element.
Both those things are making you test equipment part of the antenna.
Dave
VE7HR
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On Nov 29, 2019, at 6:58 AM, Bilbo <w7zq@...> wrote:
?Looks like your feedline is radiating and your USB connection becomes part of the antenna. Try using ferrites over the outside of the RF cable right at the antenna to decouple your cable.
