This Symmetricom 58536A 4-way GPS Antenna Splitter Divider Distribution Amplifier. These are new in their original packaging and not been used. Would consider a discount for purchase of quantity.
This is a high quality, professional grade product that allows you to share a single external GPS antenna with up to four GPS receivers/devices. While not inexpensive, it is a great solution when you have multiple devices which need to connect to an outside GPS antenna. It is made by one of the top names in GPS technology, Symmetricom. It requires no external power source. It is built like a battleship. Note that is uses N connectors, and many GPS antennas use SMA male connectors. You may need some adapters depending on your setup. If you only need to connect two receivers to the external antenna, Symmetricom makes a similar device that is much less expensive.