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The 2020 upgraded version of the 21c mic includes an improved voltage regulator circuit and the summing of signals from dual mic elements - the combination of these changes substantially enhances signal strength over electronic & background noise. Resulting benefits are improved listening clarity, higher reach into the sky for detecting calls, and many more calls extracted with automatic detection software than the original 21c design. An additional benefit of the new 21c mic circuit is that a balanced line from the mic to the power supply is now standard. This helps minimize electromagnetic interference, especially over long cable runs and/or for mics mounted on short towers.