Umbrella antenna
（重定向自Umbrella aerial）
An umbrella antenna is a top-loaded electrically lengthened monopole antenna, consisting in most cases of a mast fed at the ground end, to which a number of radial wires are connected at the top, sloping downwards. The outer end of each wire is connected by an insulator to a supporting rope or cable anchored to the ground. The radial wires can also function as guy wires to support the mast. The radial wires make the antenna look like a giant umbrella without the cloth, accounting for the name.