What is the advantage of using a properly mounted 5/8 wavelength antenna? While a 5/8 wave antenna will, indeed, exhibit an increase in signal strength at the lower angles, that increase is in the order of 3dB, (2-times the power) nowhere near the 10dB of a 10-times increase. Why are VHF or UHF mobile antennas often mounted in the center of the vehicle roof?
On the contrary, What is the advantage of using a properly mounted 5/8 wavelength antenna for VHF or UHF mobile service?
A properly mounted 5/8 wavelength antenna for VHF or UHF mobile service offers a lower angle of radiation and more gain than a 1/4 wavelength antenna and usually provides improved coverage. An antenna that concentrates signals in one direction is a beam antenna. The quad, Yagi, and dish are directional antennas.
As a consequence, Does a 5'8 wave antenna need a ground plane? The absence of a ground plane or very small ground plane will cause the matching circuit for the 5/8 wave to be a little different due to less capacitance between the vertical element and the ground plane, otherwise there is no "reflection or radiation from a second source" to produce gain in a 5/8 wavelength antenna.
In this manner, How does a vertical antenna work?
Multiband verticals use several traps or similar circuits to electrically change the length of the antenna according to the frequency of the transmitted signal. (The traps are in the vertical elements, not the radials.) Vertical antennas take little horizontal space, but they can be quite tall.
What is a ground plane and why is it used?
A ground plane on a printed circuit board (PCB) is a large area or layer of copper foil connected to the circuit's ground point, usually one terminal of the power supply. It serves as the return path for current from many different components.
Related Question for What Is The Advantage Of Using A Properly Mounted 5/8 Wavelength Antenna?
How does a collinear antenna work?
The antennas are linked in such a way that the radiating dipoles sum up all radiation intensities. 180° phase shifting is used between the dipoles to prevent destructive sums. Collinear antenna arrays usually operate in the 30 MHz to 3GHz frequency bands, providing enhanced gain and directivity.
What does the upright antenna do?
Provides low angle of radiation: The signal that emanates from a vertical antenna tends to have a low angle of radiation. Accordingly there is less at higher angles, i.e. directed towards the sky, and more that can be received by other terrestrial stations.
Do antennas need to be vertical?
Antenna polarisation basics
For the electromagnetic wave the polarization is effectively the plane in which the electric wave vibrates. So a vertical antenna (i.e. one with vertical elements) will receive vertically polarised signals best and similarly a horizontal antenna will receive horizontally polarised signals.
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