GPS Networking provides the LDCBS1X4 GPS Splitter (GNSS Splitter) with one input and four outputs. This splitter is based on the Wilkinson splitter design, and has frequency response covering the entire L-band with excellent gain flatness.
In the standard configuration, (J1) passes DC from the connected GPS device through the splitter to the input (antenna port). The other RF outputs (J2 - J4) are DC blocked and loaded with a 200Ω resistor to simulate the antenna current draw to prevent false antenna alarm faults.
For more information on the GPS splitter, download the available datasheet.