[VU2NSB] Urban Antenna Height above ground - Facts & Myths
 

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Urban Antenna Height above ground - Facts & Myths

Posted: 09 Feb 2020 11:57 AM PST
https://vu2nsb.com/urban-antenna-hei...antenna-height

Urban antenna height above ground The truth The antenna height above
ground, especially in urban areas on the HF bands, poses a set of
unforeseen issues that an average radio amateur is often blissfully
ignorant about. An experienced operator knows all this too well but a large
section of our community is often unaware of several kinds of radiation
lobe pattern distortions and reduction in overall antenna efficiency that
occur due to the presence of various natural geographical artifacts and
man-made entities like buildings, sheds, bridges, overhead cables,
water-pipes, etc that cause havoc. Despite a seemingly good antenna height,
the most common problems that usually plague a typical urban antenna
installation are considerable distortion in the radiation pattern. The
textbook lobe patterns and gain figures of antennas may not hold true
anymore. The second casualty is the overall efficiency of the antenna as a
radiator. The nearby building structures and objects within the near-field
zone of the antenna often absorb a certain amount of transmitter energy and
may also alter the resonance and spoil the attainable SWR. I have... Click
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