BOBAFETT The advantages of the GP include a low angle of elevation, which is beneficial for targeting DX (distant stations). However, in China, it may be more prone to distance errors. It's important to note that the location of the GP needs to be higher, ideally with a clear view of the horizon. A disadvantage of the GP is that it receives signals from all directions, resulting in slightly higher background noise. However, if you place it on a hillside or other suitable location outdoors, the performance will be excellent.
As for the directional and omnidirectional antennas, the directional antenna will definitely be more efficient because it's a DP (dual-polarized) antenna, and most of them are either half-wave or full-size arrays. Therefore, their efficiency is better than that of shortened-type GP (ground plane) antennas. However, they have directionality, which means the DX (distant communication) performance is not as good as that of GP antennas.
Therefore, when choosing an antenna, it's important to consider your specific situation and factors such as whether you can easily remove it, as suggested by "楼上友台".
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