That depends what other equipment you have - you only need a splitter if you're using something else alongside the zgemma like a VM router. The best splitters are the Tratec / Technetix / Ecoline range of 5-1000mhz ones but i've also used the Labgear 5-2400mhz ones from Screwfix which have done the job fine. Use quality cable (wire) and the shortest length possible for the job.