I would like to build a 908Mhz turnstile.

How does one normally go about testing and adjusting an
antenna at that high of frequency?


For a lower frequency I can hook up a MFJ antenna analizer or an SWR
meter,.

I want to build a 900Mhz antenna with a hemispherical pattern.
It is going on an RC plane, so a normal vertical style antenna will
be problematic as it will have a null straight down.

So I though a turnstile antenna would be perfect.


Any advise on designing such a device?


Paul Kl7JG