This paper analyzes the impact of the reactive region on near-field channel gain for both spatially-discrete (SPD) and continuous-aperture (CAP) arrays. The authors derive novel expressions for near-field channel gains that account for both radiating and reactive components of the electromagnetic field. They show that, even as the array aperture size approaches infinity, the impact of the reactive region on near-field channel gain is negligible. Asymptotic analyses are performed to confirm this conclusion. The results indicate that the channel gain with the reactive region considered is smaller than that without it, and the difference decreases rapidly with increasing propagation distance. Numerical simulations further validate these findings, showing that the impact of the reactive region on near-field channel gain is negligible, even for infinitely large arrays. The paper concludes that, in practical near-field analyses, the presence of the reactive region can be disregarded for both SPD and CAP arrays.This paper analyzes the impact of the reactive region on near-field channel gain for both spatially-discrete (SPD) and continuous-aperture (CAP) arrays. The authors derive novel expressions for near-field channel gains that account for both radiating and reactive components of the electromagnetic field. They show that, even as the array aperture size approaches infinity, the impact of the reactive region on near-field channel gain is negligible. Asymptotic analyses are performed to confirm this conclusion. The results indicate that the channel gain with the reactive region considered is smaller than that without it, and the difference decreases rapidly with increasing propagation distance. Numerical simulations further validate these findings, showing that the impact of the reactive region on near-field channel gain is negligible, even for infinitely large arrays. The paper concludes that, in practical near-field analyses, the presence of the reactive region can be disregarded for both SPD and CAP arrays.