[TowerTalk] Resonance is over rated

[Steve Hunt]

Antenna efficiency (as opposed to antenna system efficiency) has little 
to do with resonance, but a lot to do with its radiation resistance 
relative to its loss resistances.

A resonant dipole with a feedpoint impedance of 70+j0 which includes 
copper losses of 1 ohm has an efficiency of 69/70=98.6%.  A non-resonant 
dipole with a feedpoint impedance of 70+j1000 has exactly the same 
efficiency - 98.6% !!

And just to end with some nonsense: a monoband antenna can only be 
resonant at one spot frequency - so don't speak into the mic, or press 
the key, because those sidebands you generate will be on frequencies 
where the antenna isn't resonant :)

73,
Steve G3TXQ