Plot twist: Gordon doesn’t actually need the bat signal to contact him. It’s there to drive fear to street criminals when they see the sign and think that the Bat is heading their way.

Also Gordon prefers talking to the man dressed like a bat on the rooftop rather than in his small office.

Batman actually maintains a remote link to the light itself. As soon as the switch is flipped, he gets notified.

Cmon, his lair is a CAVE. how the fuck is he gonna see the signal anyway?? Does he maintain 24/7 surveillance of the entire sky?

In Gotham? it’s always cloudy, and night time 95% of the time

Wait for a passing blimp. Project the bat signal on the blimp.