The aim is to achieve robust broadcasting and the paper explores how the propagation environment affects different MPR-based broadcast methods. There are several methods, or combinations of methods, that can be used to increase the robustness of MPR-based flooding. As a reference we consider the basic MPR selection method in OLSR, called MPR-default, and investigate the use of physical layer information and additional MPRs. It is also important to consider the cost of implementing these methods. To investigate which method to choose, a channel model that mimics real radio transmissions is employed. We consider an urban, a flat plain and a hilly forest environment. The results show, among other things, that the choice of method depends on the dynamics of the channel and the network connectivity. The MPR-default method does not give enough robustness, except when the mobility is low and the environment is flat, so other methods are required. For sparse networks, using additional MPRs is a good choice, but for dense networks, using physical layer information and a fading margin is more efficient.