Clears his throat to make his presence known…
Sector 7 would seem the most likely place to put a hidden, temporary base. Any sector would be only one transition away from the Gate, however, this one contains nebulae and asteroids, with no enemy-held positions. Sectors 4 & 6 would seem like good sectors, except we saw a lot of incoming enemy transitions to Sector 5 from the Spinwards and Trailing borders. Plus, it’s far off any routes that should be likely to be traveled.