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Old December 27th 05, 01:39 PM posted to rec.radio.amateur.antenna
Richard Fry
 
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Default If the ideal lenght of an antenna is 1/4 Wave lenght then way are the Car Cellular antennas are longer then this ?

"Hal Rosser" wrote:
Right you are.
Like I said - using a 5/8 wave vertical flattens out the "doughnut of
propogation."
And using two - back-to-back as a dipole will exhibit gain as well -
over a dipole.

______________

If you mean gain over a _ 1/2-wave _ dipole, then all of the single
verticals 90 degrees in the plots I posted earlier (with their "image"
components) already have greater peak gain than that.

The peak, intrinsic gain of the 90 degree vertical and its image in my plots
exactly matches the free-space peak gain of a self-resonant, 1/2-wave dipole
(2.15 dBi).

The fact that all of the radiation from these verticals is confined to a 1/2
hemisphere adds 3 dB h-plane gain to all of the plots.

RF