The animated TECHTip Tutorial is available here.

Cellular-mobile, delivery, and automobile whip/rod/vertical antennas use the body/case of the object to create a virtual earth/ground to form a 1/2 wavelength antenna. That is, this type of antenna uses a 1/4 wavelength for transmission and reception and the other 1/4 for ground.

The effect of the ground or ground effect to create a reflection of the signal to improve omni-directional (all direction) transmission and reception desired by mobile devices.

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[tags]antenna,cellular,techtionary,polarization,wavelength,omni-directional[/tags]