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The correct frequency for communication with GC North Tower during regular operations at O'Hare Airport is 124.125. This frequency is designated for air traffic control communication specific to that area, allowing pilots and ground control to coordinate safe and efficient operations, including takeoffs, landings, and taxiing procedures.

Using the correct frequency is crucial for ensuring that all parties are on the same communication channel, which minimizes the risk of miscommunication and enhances overall safety on the airfield. Other frequencies provided in the options, while used for different purposes or areas of communication, do not apply specifically to GC North Tower operations. This makes 124.125 the essential frequency for pilots operating in the designated space.