Cecil Moore wrote:
tom wrote:
Note that none of these are particularly close to resonance at the
design frequency.

Yagis do have a resonant frequency but that frequency
is not at the design frequency. At the resonant frequency,
the forward gain and F/B ratio are not optimum. At the
optimum forward gain frequency and/or F/B ratio frequency,
the Yagi, sans matching network, is not resonant.

Agreed, although it has become popular to make designs with about 50+j0
driven elements lately. I think it's to make them simpler and lighter
because, as you say, the other characteristics are not optimum if you do.

tom
K0TAR