The vibration of and the acoustic radiation from a semiinfinite taut membrane is considered. The plane of the membrane is extended by a semiinfinite rigid baffle. A compressible fluid fills the half‐space on one side of the membrane and baffle. Two types of vibration are considered: (i) natural motion of the membrane due to an incoming acoustically slow wave on the membrane incident normally on the edge, and (ii) forced motion of the membrane, the force having sinusoidal space and time dependence. The forced motion thus is somewhat analogous to the single‐mode‐vibration of a finite membrane. The shape of the membrane and the associated acoustic radiation are discussed and compared with the case when fluid loading is not present.