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20 kwi 2003 · Following is a series of dipole radiation pattern plots, produced by a popular antenna modeling program. The first plot below shows a dipole at an elevation of two wavelengths above a standard earth ground model. Note the multiple lobes at varying elevation angles above the horizontal.
The antenna radiation pattern strongly depends on the length and height. In the examples below I hope to make the differences clear.
28 kwi 2023 · Given the high quality of today’s transceivers, the most important station component is the antenna system that starts at the RF connector of your radio and ends a wavelength or two away. Gains and losses anywhere in the system affect signal strength.
Through detailed explanations and practical examples, the chapter provides amateur radio operators with the knowledge to adjust their antenna setups for optimal vertical radiation angles, thereby enhancing their ability to communicate over vast distances. ... Goto Course.
Let’s consider an example: a quarter wave whip antenna on a VHF or UHF handheld radio. This is a common application of an end-fed antenna (although they are often a helical wound “Rubber Ducky” instead of a straight quarter wave, but the same principles apply).
From what I know a loop antenna radiates perpendicularly to the plane of the antenna which means it will radiate 50% of the energy to the ground and 50% - to zenith. Thus on 80m only short distance communication will be possible.
To find out, I challenged the rain-gutter loop with EZNEC antenna modeling software. This required best-case and worst-caswe models to encompass most house variables: (1) two loop heights, (2) two house types and (3) several bands. These would place most houses somewhere within these limits.
