I did notice little stub antennas in corridors but am not sure what
> equipment they were for.
I believe those antennas may be part of the telemetry system which monitors patients while they are ambulatory away from their bed (e.g., moving about in the hallway, sitting down the hall in the solarium, etc.).
Or perhaps what you saw are associated with some sort of wireless LAN access point, although I think my first guess is more likely.