[quote=Raxacoricofallapatorius]
A hospital might not be the safest place. In fact, any place that masses of people converge onto will become a target, strategically speaking (if I was an alien invader that's what I would do). It would be best to get out of the city, or at least as far away from the downtown area as possible, toward the outskirts. 
[/quote]

To be specific, my idea was that the hospital safe-zone holds out against the scouts until the main army shows up, giving us about 1-5 days of recovery time in the hospital. Just to clarify. 

Also, I'm a big fan of this 'use their technology' idea for our escape. I'd prefer cloaking devices, because it increases the tension. It also would make for a tense scene when we realize there are invisible infiltrators in the hospital. See [url=https://www.youtube.com/watch?v=bwNyPXE3-Zg]here[/url] for something like that. You'll want to skip to the 1 hour mark.