John - here are 2 photos from Hunnicutt’s Halftracks that show the M3A1. The M3A2 isn’t even in the book! Anyway, the radio is located in the right rear of the troop compartment, under the overhang next to the antenna mast. You can just see it on the right in the rear view. It’s under the canteens in the top view. HTH!
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