The study investigates the electronic structure and magnetic properties of CrSb, a material with alternagnetism (AM), a novel magnetic state that combines ferromagnetic and antiferromagnetic properties. CrSb exhibits a high Néel temperature of 700K and significant spin splitting near the Fermi level ($E_F$), making it a promising candidate for spintronics applications. Using high-resolution angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) calculations, the researchers map the three-dimensional (3D) electronic structure of CrSb. The results reveal unprecedented details on AM-induced band splitting and confirm its unique bulk $g$-wave symmetry through quantitative analysis of angular and photon-energy dependence of spin splitting. The observed spin splitting reaches 0.93 eV near $E_F$, the largest among all confirmed AM materials. This study validates CrSb as a prototype $g$-wave-like AM material and highlights its potential in spintronics.The study investigates the electronic structure and magnetic properties of CrSb, a material with alternagnetism (AM), a novel magnetic state that combines ferromagnetic and antiferromagnetic properties. CrSb exhibits a high Néel temperature of 700K and significant spin splitting near the Fermi level ($E_F$), making it a promising candidate for spintronics applications. Using high-resolution angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) calculations, the researchers map the three-dimensional (3D) electronic structure of CrSb. The results reveal unprecedented details on AM-induced band splitting and confirm its unique bulk $g$-wave symmetry through quantitative analysis of angular and photon-energy dependence of spin splitting. The observed spin splitting reaches 0.93 eV near $E_F$, the largest among all confirmed AM materials. This study validates CrSb as a prototype $g$-wave-like AM material and highlights its potential in spintronics.