Need help - how to design helix antenna?

I want to design a home-made helix antenna for a modem wireless 2.6G. Please, guild me what i can do?
Thanks alot.

refer to the below link

https://www.edaboard.com/viewtopic.php?t=281361

Johm Kraus "Antennas" is an excellent reference for helicies. He is the master on these antennas.

THX all