A1A This is likely because the handheld antenna was designed with human holding in mind, treating both the handheld casing and the human body as part of the ground plane. However, simply connecting the network using jumper cables, testing showed that without this ground plane component, the measurement results would be inaccurate. If you want to measure the handheld antenna relatively accurately, you can refer to other compatible solutions on Bilibili, such as using a soda can casing as an equivalent ground plane, or measuring with old handhelds.
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