poorly directive antenna

例句：

1. 1.The poor quality of the antenna made it difficult to receive signals from the satellite.
   天线的质量差，使得从卫星接收信号变得困难。
2. 2. The engineers were unhappy with the design of the antenna and considered it unsuitable for their purposes.
   工程师对天线的设计不满意，认为它不适合他们的目的。
3. 3.The antenna is not optimally designed for this frequency range, which limits its effectiveness.
   天线在频率范围内设计得不够理想，这限制了其有效性。