band planar spirals (for estqwerty) - что за антенны ?

[estqwerty]

i think that tuskan mean "этакая бесконечная банка" heliax coax cable - but this is still not a waveguide it is more coax very low loss coax.
if you wish you can use very long tubes as waveguides for transmission lines, this will be better than coax lines.

I do not wish to mess in this treat Спиральная антенна Helix (Хеликс) - so I will ask here :
What You thing about this 5 - 6 GHz Helical Antennas
Is it possible to make spiral antenna for 5gz band ?
I've heard that yagies do not work. Is anyone read something in big books ???