Art Unwin wrote:
On top of that, all the antennas that you point to could all be made
resonant in the right type of environment.

Point is, the Yagi radiation pattern sucks at the resonant
frequency, f(r). When one meets the designed-for radiation
pattern, i.e. gain, F/B ratio, beamwidth, etc., the Yagi is
NOT resonant at the design frequency.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com