Vertical antennas are very popular for HF operation because they fit in well to a small garden. There are two types, those that are best installed at ground level and those that can be installed on top of a mast. All verticals need a good earth and those designs that look as if no earth is needed and can be counted at the top of a mast, are in fact usually half-wave vertical dipoles rather than quarter wave verticals.
Quarter Wave Multiband Verticals
These are mostly trap designs and are usually mounted and fed at ground level, to make use of the natural ground provided by the average garden. As such they take up very little space. Whilst they will operate even if just a single copper earth rod is used, they work much more efficiently if radials are added. Radials DO NOT need to be resonant. In fact if whether buried or laid on the ground, they will be anything but resonant! The golden rule is the more the better; short or long. Longer is better than short, but short is better than none.
Verticals Multi-Band Without Radiasl (Vertical Dipoles)
Although they may look like a simple vertical, in most cases they are vertical dipoles. The great advantage is that they do ot need an earth and can be mounted on top of a mast. Many of the designs are quite compressed in terms of length and as a result they have a narrower bandwidth and of courst they are more exposed to windd damage. In reality you are trading a slightly improved efficiency with narrower bandwidth. A narrower bandwidth can be a problem for some and the more the compressed the design, so losses begin to creep in because of inductive loading.
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