I also run SiliconDust products in my home network.
http://forum.tvfool.com/showthread.php?t=820
It looks as if your hope of mounting the antenna(s) indoors has a fairly good chance for success, the signal levels available to you are actually very good for the most part.
I would suggest using an Antennas Direct DB-4e facing SE. This antenna is reasonably compact but it out performs similar 4-bay panel antenna designs. Like other UHF only antennas, it lacks coverage of VHF channels (real channels 2 through 13). From indoors, that would only impact your ability to receive WMUR, but WCVB is an ABC affiliate that will be easy to get.
Try the existing coax. Quad Shield is not needed for OTA applications (though it will work fine).
If you want to consider reception of some of the weaker signals to the NE, Multiple HDHR's can be used to terminate multiple antennas.