Thread: Whip on portable vs Dipole Gain for 2m or 70cm
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Old December 12th 07, 04:41 PM posted to rec.radio.amateur.antenna
Richard Clark Richard Clark is offline
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Default Whip on portable vs Dipole Gain for 2m or 70cm
On Tue, 11 Dec 2007 02:40:41 -0800 (PST), wrote:

Would like to compare link budget between
portable-radio with typical small rubber whip antenna and
vehicular-radio with 1/4-wave or 5/8 antenna or vertical dipole on the
roof

Hi OM,

Rubber Ducky performance is an unknown quantity, but certainly can be
improved.

Gain difference between vertical ground plane and dipole is about 2dB.

What I'm looking for is the gain difference between

portable whip
bad, maybe
1/4-wave on car roof
OK, maybe
5/8 on car roof
better, maybe
Vertical dipole
OK, maybe

All such valuations vary a lot with height. With enough height, you
could use a rubber ducky anywhere.

Does anybody have more info?

It would be simpler if you examine exactly your situation using EZNEC.
The free version should be capable of doing a lot of this.

73's
Richard Clark, KB7QHC
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