Topband: Non-resonant receive antennas

[JC]

" Since Rick correctly stated that RDF doesn't account"


Jim

RDF is  everything !   The RX antenna system is the only way to improve
signal to noise ratio. All electronic device is not perfect and introduce
noise and deteriorate the signal to noise ratio, including your radio too

RDF is one way to measure directivity . 

You may do not need directivity to improve signal to noise ratio if you are
operating from a very  quiet location or a desert island on the pacific
without man made noise. 

If you deal with noise at your location you will select the antenna with
better directivity. That's adds another component how to cover all
directions.

Better RDF equals to better signal to noise ratio. 

That's is true for all bands, try to work 20 meter contest with a vertical
with 1 kW and compare with a 5 elements Yagi with 100W.  Your TX signal will
be the same however for sure you will prefer to receive on  the Yagi due its
directivity. You won't hear much on the vertical

Regards
JC
N4IS


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