Draw a circle for example in (x,y,z)=(radius,0,0).
Right click choose view and select fit all.
Mark the circle and then select "draw helix" in the top bar menu. This will make a helix with a radius with a center i (x,y,z)=(0,0,0). If this is unappropriate you can define a new coordinate system.
You can choose between dx, dy and dz, this desides in which direction the helix will go.
Hope this helps
Do you know what kind of pattern an helical antenna whose diameter is 10 cm has?
A cos pattern?
A delta pattern?
Thanks in advance. It's very important to me.