Forgot to answer one question
I forgot to answer the question on the gain.
Usually you can either normalize the gain, or have it graphed relative to isotropic radiator. I used the later.
Just for comparison - here are calculations for the Avant-Trivec 2055-3, and as you can see the results are pretty dead on what they claim:
Frequency 240-318MHz
VSWR 1.5:1
Polarization Right Hand Circular
Gain +10.5 dBi, 244-318 MHz
Power Handling 200 Watts CW
Axial Ratio 3 dB at half power points
Weight 3.1 pounds
Connector BNC Female
You can see that the attached charts give the same result.
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