Longer rental periods, more channels, microphone and antenna upgrades - all available
It is keeping harder and more complex to mange wireless sytems. Why?
As a result it is often necessary to use computer programs to calculate available channels to set your systems to.
Shure's RF Workbench software is the go to tool if you have a variety of brands and models to co-ordinate. If you are using more homogenous systems the major manufacturers have there own tools or lists of compatible frequencies for various areas.