Concordo contigo, que o nome sugere ísto. Mas na descrição fala de conectar um rádio em múltiplas antenas. Um simples divisor.
HyperGain® 2.4 GHz Signal Splitters / Signal Combiners are used for connecting more than one antenna to a single radio. They feature weather-proof construction and can be installed indoors or outdoors. This 4-way splitter can be used with amplified systems since they will pass DC power to all ports. HyperGain® 2.4GHz WLAN Signal Splitters / Combiners are also available in 2-way and 3-way models with N-Female, RP-TNC Jack and SMA connectors.
E como as coisas lá fora são baratas. 69 dolares.