Base corrections over UART stop, only get single solution

Mikhail had a comment in this post that suggested being able to unject power into an antenna requiring > 3.3V

Does a “power injector” prevent power running back to the reach unit? Or can the reach cope with a higher voltage coming back down the line?
Some of the sit7ations that I want to use this in are alongside another GPS unit that has a large high gain antenna running at 10V. Splitting the cable from the antenna to both GPS’s would be absolutely ideal

Bruce