The GPS311 from INSTOCK Wireless Components is a GNSS Splitters with Frequency 1 to 2 GHz, Input Power Splitter: 15 to 30 W (IN-Phase), 0.75 to 30 W (Out-Of-Phase), Combiner: 3 X 10 Watts (In-Phase), 3 X 0.125 Watts (Out-Of-Phase), Insertion Loss 0.6 dB, Isolation 22 dB. Tags: Module with Connector, Wilkinson. More details for GPS311 can be seen below.