This document summarizes a study on a receiver-based multicast protocol for wireless sensor networks. The protocol, called Receiver-Based Multicast (RBMulticast), removes the need for intermediate nodes to maintain multicast tree state information by embedding multicast member addresses in packet headers. This allows intermediate nodes to forward packets without storing state. The protocol was implemented and tested in the OPNET simulator. It requires less state than existing multicast protocols, making it well-suited for dynamic wireless sensor networks.