One antenna pointed north should give you a fairly complete line-up of the major networks, one exception being PBS which may need a dedicated antenna pointed west.
I'd take advantage of the roof height and mount a Winegard HD7694P pointing toward the north. I'd also want PBS so I'd point an Antennacraft Y526 toward the west. Use a HLSJ (High Low Signal Joiner) to combine the two antennas.
http://www.solidsignal.com/pview.asp...-%28zhlsj-1%29
I would try the installation with no amplifier. If the need for one is proven, a CM-3410 can be inserted at any convenient point between the HLSJ and passive splitter.