To make a seawater antenna, the current probe (an electrical coil roughly the size and shape of a large doughnut) is attached to a radio’s antenna jack.

为制作一根海水天线，电流探针（一种电子线圈，尺寸跟形状大致相当于一个大炸面圈）要连接到一副无线电天线端子上。

youdao

A football field sized area can be covered by two people in an hour with one of these units coup led with the large antenna coil.

一个足球场大小的面积可以覆盖在一小时内由两个人同与大型天线线圈加上这些单位之一。

youdao

In addition, an antenna section protective indication for indicating an information writing area other than the area on an antenna coil is provided on a cartridge label.

另外，磁带盒标签上具有避开天线线圈的把信息记述区域指示出来的天线部保护显示。

youdao

That allowed a 10x increase in power delivery -- up to 50 microwatts to a millimeter radius antenna coil -- to an implant five centimeters below the skin.

ENGADGET: Stanford researchers make heart implant powered by radio waves, put batteries out of a job