大多数电视台都会在转换过程中使用备用天线，从发射塔卸下老式的模拟天线，而代之以新的数字天线塔杆。
Most television stations will use backup antennas during the transition while their old analogue ones are taken down from their towers and replaced with new digital masts.
1个备用的接收天线和1个备用的高压气体罐。
该安全和营救设备用于高大建筑物， 具体说例如风力发电机、钻井平台和天线塔。
The safety and rescue equipment is used in tall structures in particular, such as in windmills, on drilling platforms and in antenna masts.
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