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The setup is at least nearer to a water imersed monopole. I'm not sure, if the water volume is large enough to absorb most of radiated waves, if not, you'll still see reflections at the air interface in measurement results.

Not only resonance frequency, also impedance will be massively affected by medium permittivity. But what's the purpose of your experiments?

Don't think that you can buy this kind of antenna. But you can make it yourself without much effort.

Do you mind to post a link to quoted literature?