Before you pick an antenna, regardless of manufacture, you need to fill in some blanks;
How far do you need to cover in miles?
Is the pattern omni in coverage?
Will you need down tilt?
Is the hospital on a hill or elevated from the coverage area.
What is the wind Sq. Ft. Loading the mount can stand?
How long is the antenna expected to last?
and...........
What is your budget?
Other questions abound.
Have you done an intermod study?
Is foot traffic a problem for RF safety?
Coax connector needed?
What level of filters are needed for operation in a high RF field? (other radios)
Where is it going to be mounted? Will a professional tower rigger be needed?
Grounding?

??
As you can see there is more than just buying any old antenna.