Simple wire dipoles

摘要

The antenna is a crucial element in any radio station. Upon its efficiency depends the operation of the whole station. Yet antennas do not need to be large and expensive to perform well. While a multi-element beam on a high tower in an ideal location is the dream of most hams, few of us are in the position to be able to erect such a system. For most, antennas need to be more modest. Gardens are not usually very large, and the visual impact of the antenna also needs to be considered. This limits the size and nature of any antenna that can be erected. Yet simple antennas can still be very effective and enable a good selection of stations near and far to be contacted. Possibly the simplest antenna is an end-fed wire, but they do have a number of drawbacks, including a greater likelihood of causing interference to local domestic electronic equipment.