Whole terminal draws 100 watts of power from PoE and the antenna is a phased array that electronically tracks the satellite as it moves across the sky. The system is designed to maximize the RF power to the satellite, not spill it off the side where it could be intercepted by an observer. RF follows the inverse square law, so if you’re close enough to detect a milli- or micro-watt leakage signal you’re also close enough to get your ass shot or blown out of the sky.
I’m quite certain you cannot pull 100 watts over Ethernet IG that is what you meant (obviously might not be)
The fact that they are minimizing rf spill would actually serve to make the locating system more accurate (but it has to be detected in the first place)
I suspect that combined with other techniques this will work fairly well, at least for a bit