Are you looking to get the Baltimore station too?
I'd start with an Antennas Direct Clearstream 2V (*not* the 2) because it has hi-vhf capabilities that you will need for DC 7 & 9 & Baltimore 11 & 13.
http://www.antennasdirect.com/store/...V-Antenna.html
Aim it at magnetic 60 degrees, which will put the DC towers in a strong backside lobe
see the pattern at
http://www.antennasdirect.com/cmss_f...%2BVHF-TDS.pdf
Test it with 1 run of known good cable to 1 tv to start.
If you are going to feed 4 tv's , you will probably need some form of amplification to overcome cable loses.
The RCA TVPRAMP1R is well thought of, and seems to handle the potential for signal overload quite well.