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4

There isn't a way to calculate efficiency from gain, in general. If you had the gain for every possible direction then you could integrate over the entire sphere and calculate the total radiated power and compare that to an ideal isotropic antenna. From that you could calculate efficiency since the reference isotropic antenna is 100% efficient by definition. ...


4

Given the information supplied, and no other independent measurements, you can't really tell. You could guess, by looking at the size of the antenna, which is ~3.25 wavelengths long, and figuring that it's probably such-and-such a colinear design, which should have such-and-such a directivity. But that's probably a pointless exercise, because manufacturers ...


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