Scientists have to periodically rearrange them in order to find the best configuration with the least amount of radio interference.

科学家必须定期重新设置下天线，从而在最小无线干预的情况下找到最佳配置。

Well, these parts of South Africa and Australia actually have some of the lowest radio interference anywhere in the world, and positioning elements in both those places gives it a catchment area that effectively spans two continents.

好吧， 南非和澳大利亚的这些地区实际上拥有世界上最低的无线电干扰，而这两个地方的定位元素使其成为有效跨越两大洲的集水区。