Al -
I have a coax cable running from my apartment up the window well to
the roof antennas. It is a long run of 9913 to the roof antenna switch box
at 35 meters up along the brick wall.
I wanted to load the feed line so I could try 160M with my SPC coupler..
However, like your building, this one is also concrete, steel and brick.
I found I could not get out at all.  ICable clamped against the bricks is 
poor, obviously.  The RF gets absorbed by the wall.
Just a note to let you know the problem.  Some of the other suggestions
have much more merit.
73 -  Don,  VE1BN
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