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Looks like a 11/4" jack. I purchased a cobra hg s 500. I enjoyed the sound from the cobra much better than the original Madison speaker I was using along with the uniden madison. I purchased another for my Sonar. Most who use 30-40 year old radio's don't realize the speakers that are original to those rigs have seen better days.

The two cobra external replacements made a big difference for the better.

73's