help : How to design monopole antenna omnidirectional CST MWS?

Hello Guys,
How can i design monopole antenna really Like image below at 900 MHz frequency in CST MWS?

Please anyone can give me tutorial step by step and what are materials need?
thank you be4

hi
the problem with this kind of design is matching.
there is two way i know
first one is based on lumped element matching.
second one is increasing antenna diameter.