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Boosting environmental noise detection with a parabolic sound mirror?

I want to frequency analyse the [non-directional] ambient noise in a rural setting.
However I suspect that my high quality - but small - microphone will not be sensitive enough.
If I use a, say, 1 metre, parabolic dish as a sound collector focussed onto the mike, will I get a boosted signal?
If so, will it still have the same frequency response as the mike ... or will diffraction etc effects change the response?