The post was suddenly moved to the top today.😃Thank you all for your suggestions. After considering your advice, I replaced the original antenna with a vertical antenna, and my reception has improved significantly.I didn't expect the size of the "Z" to be so large.😂
However, this also introduced a new minor issue: while the performance with European launch and reception was good, it was significantly worse compared to domestic communication. I suspect that this is because, assuming a rooftop location with a relatively high altitude, the antenna's effective angle of elevation has decreased, which in turn negatively impacts close-range communication.
I would like to ask experienced seniors for their advice on whether adjusting the physical antenna tilt angle can improve this issue of weak communication at close range.
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