how to make digital antenna ?

stainless wire to make digital antenna info please.

There is no such thing really as a "digital" antenna, there are just antennae designed to receive well for a given frequency/wavelength. The best length for a simple antenna, mounted on a good ground plane, is 1/4 of the wavelength of the radio you want to receive. If you want an antenna to have some gain, look for things like Helicals, Yagi, slim jims, "Pringle cans" and many others !