Building the tetraQuad

I don't know the real name for this antenna, but it is four Quads stacked end on end and feed in alternating phases. It also seems to be an extremely forgiving design. I made quite a mess of the construction and I'm getting somewhere close to 14dBi gain. It is very close in performance to the lucent 14dBi antenna I have (theoretical max 19Dbi). I did think I was getting none, but discovered that the antenna is horizontally polarized when held vertically. It seems to have quite a wide horizontal pattern, but a limited vertical one. This is wider than the theory suggests and is no doubt where the extra gain went.

I also built a six diamond version, but it performed no better (or worse).

Free Space
Side Lengthmm
Offset from reflectormm
Reflector heightmm (Minimum)
Reflector Widthmm (Minimum)
The size of the reflector and its distance from the active element affect the feed impedance. The ARRL handbook says there should be a 1/4 wavelength edge beyond the active element.

Misc Notes

From the front.
From the Back
Looking down on it when it is aligned for vertical polarization (i.e. the diamonds are horizontal)