Yes, the booster is mandatory! The booster should be installed with every setup.
The booster was initially created for distance, but as the world has become more "wireless" since the introduction of the TireMinder system in 2008, signal interference has grown exponentially. We have included a signal booster in every kit since mid-2013, unless otherwise indicated, because of this fact. The booster needs to be installed to combat signal interference and make sure that you are getting the best signal possible.