Looks monopole-like? The TX power didn't change much unless the board antenna was poorly matched to begin with. Angle the board so that the other device is in the null of the radiation pattern and the range becomes awful
this post was submitted on 11 Apr 2025
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It won't broadcast well directly above the antenna and directly below. It's a small device so orientation will matter.
This is why I've never been a fan of the on PCB antenna.
And why this antenna design?