[Amps] Antenna vs. amp (was: al-1200 question)

[Gary Schafer]

Tom Rauch wrote:

> > The only thing to remember is that you can not have gain in an antenna
> > unless you have directivity. Gain in a particular direction comes from
> > reducing it in other directions.
>
> It depends on what the reference antenna is.
>
> An isotropic radiator has several dB gain over a GAP vertical on 80
> meters, even though it is less directional.
>
> Gain is a function of efficiency and directivity, while for receiving
> efficiency can be pretty much left out...at least within reasonable
> limits.
>
> The only reason I brought this up is people commonly think
> anything they do to increase gain by lowering feedline or antenna
> loss helps on receiving a similar amount...yet clearly that is not
> true.
> 73, Tom W8JI
> W8JI@contesting.com

Good points Tom.

I was thinking more of the difference between 2 antennas of similar
efficiencies. Dipole verses a multi element beam for instance.

73
Gary  K4FMX