If two XD-V55 receivers are connected via the antenna splitter kit and the receivers are powered on individually, the receiver that is powered on second will not initiate. The receivers must be powered on simultaneously to work.
The antenna splitter kit requires the two SMA MALE to BNC MALE cables that the XD-V55 rackmount kit provides. As such, it is assumed that the receivers are rackmounted AND powered by a power strip.