A neutron‐diffraction study of antiferromagnetism and the wave‐vector‐dependent susceptibility of Tb near its Ne´el temperature shows a susceptibility which can be represented over a range of temperatures by &khgr;q−1=&khgr;Q−1+ (qz−Q)2/(eq0)2+ (qx2+qy2)q02withe=2.6 andq0=0.017 (4&pgr;b3) and with a &khgr;Qwhich roughly follows the expression [(T−TN)/T1]−4/3, withT1=6°K. There is a more rapid decrease in &khgr;qthan predicted by the Lorentzian form for large values of (qz−Q) and a less rapid decrease than predicted for large values ofqx. The wave vector for which &khgr;qis a maximum shifts further away from ferromagnetism the higher the temperature.