My guess would be the one in the rectangular plate. It has the booster switch on it that says it should be in the right position for cable, left for the antenna. The round plate below is an external plate that was probably added by a previous owner. They are usually used outside and have a rubber cap attached at the slot in the 10 o'clock position that covers the jack and protects it from the weather.
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2013 Silverado 2500HD LTZ CC 6.6L Duramax Diesel
2023 Rockwood 2445WS
Buster, miniature Dachshund
2024: 2 trips, 26 nights in 8 states, 4801 miles
2023: 9 trips, 48 nights in 12 states, 2 provinces, 8120 miles
2019: 7 trips, 43 nights in 6 states, 3904 miles
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