Good wire for small antenna

Hello,

i looking for the best wire to build wire antena like quadrifilar etc.
i want the best reference for solid wire because the ones i found are too soft

thanks

Metal tubes are the usual choice.

Thanks
But i?m looking for diameter about 1mm

I assume the antenna is dedicated for high frequencies. In this case the best wire would be silver plated copper wire.
https://www.wires.co.uk/acatalog/cu_sp.html

You can use RG402 coax which has 1.3mm core diameter.

Thanks Vfone for your answer , i tried to use this wire .

by small antenna, do you mean "electrically small"?
If so the resistance in the wire will be CRITICAL if you want it to radiate any power at all. I have even used solid silver wire in certain applications, since silver has the lowest resistivity