[Towertalk] limitations of stacking

[Tom Rauch]

> As an example, the classical elementary dipole (with length <<
> wavelength) has a dipolar radiation pattern in the far field; that 
> pattern is independent of the dipole's length. But an elementary
> dipole also has a radiative resistance and therefore a gain that
> varies with its length squared. That's an infinite family of
> identical-pattern antennas possessing differing gains.

Please tell me how, with fixed efficiency, one dipole has gain over 
another without having a pattern change.

Is this like the folklore a double Bazooka or coaxial dipole has 
gain, or a folded s dipole, because the "radiation resistance" is 
higher?
73, Tom W8JI
W8JI@contesting.com