Most of the Tv stations are to the south/east and south/west.
For a indoor antenna I recommend a Terk HDTVi antenna aimed at about 180 degree magnetic compass , in between the 2 groups of Tv stations to the south/east and south/west so as to receive the 2 groups of Tv stations.
Here is how to aim indoor antenna ,
http://www.kyes.com/antenna/pointing/pointing.html.
Best place for reception Will Be a south wall or a wall that is close to something like a south wall or window.
As to the multipul door ways , well.
There are rubber strips that go on the floor of door ways , the rubber strips have a channel through them so that extension cords , phone cords , coax cable can be passed across the door way.
Also do the buildings have satellite dishes outside??
Here is a Tv Antenna that looks like a small dish , On Purpose.
http://www.antennacraft.net/Manuals/HDX1000_manual.pdf.
If the HDX1000 is outside aim the HDX1000 at about 180 degree magnetic compass.
Here is how to aim outdoor type antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here are places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.antennacraft.net ,
http://www.amazon.com.