Good call. Next time include layout, my crystal ball wasn't working. What no coax or stripline to antenna, with orthogonal orientation of antenna to diode input tracks?
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I think it might already have that, but I'll need to trace it and check. Good idea though.
Can you expand on what you mean about the ideal length for interference? I did think about attaching my own antenna made from a bit of wire to improve reception but I've not researched the requirements for a bluetooth antenna yet.