I have two GPSDO's, a Tbolt and an Arbiter. When I got them (simultaneously) I wanted to get them up and I only had one antenna. However I confirmed that a consumer TV splitter works very well with the GPS antennas. There are some splitters that claim 2 GHz bandwidth. It's not useful for the intended application (CATV rarely goes above 850 MHz) but they are fine for this. And they will have a "power pass" output port that is the one that powers the antenna. In my case the Arbiter had a more precise supply for the antenna for what its worth. The Arbiter has a Motorola receiver and a Wenzel Oscillator.
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