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这是一个非常易于制作的VHF基地台天线,它在接收来自头顶或者地平线方向的信号时都有相同的良好表现。曾经设计安装在航天器上探索宇宙的四螺旋天线(QuadrifilarHelixantenna,下文将简称为QFH天线),在业余无线电中并不是很流行。但是,作为一种两米波段的基地台天线,很难有其他天线可以打败它。它几乎相当于水平和垂直两个全向天线的复合体,就像理想状态中的全向辐射源一样。不论接收哪个方向的信号,不论是垂直极化
This is a very easy-to-make VHF base station antenna that performs equally well when receiving signals from overhead or horizon. Quadrifilar Helixantenna, which has been designed to be installed on spacecraft to explore the universe, will be referred to as a QFH antenna for short, and is not popular with amateur radios. However, as a two-meter band base station antenna, it is very difficult for other antennas to defeat it. It is almost equivalent to a horizontal and vertical composite of two omni-directional antennas, just like an omni-directional radiation source in the ideal state. No matter which direction the signal is received, regardless of vertical polarization