There aren't many VHF-High antennas being made now. Antennacraft folded with the Radio Shack problem, and Winegard stopped making them.
Antennas Direct makes a VHF dipole kit that could attached to the DB8E, but I don't think it has enough gain for Fox on 13. They also make the C5 which comes with a UHF/VHF diplexer. The C5 has more gain than the dipole, which
might be enough for Fox. It would also give you 9 and 11.
AbilityHDTV sells the Fracarro BLV6F VHF-HI (CH7-13) High Gain Wideband YAGI Antenna, but I have no experience with it.
http://www.abilityhdtv.com/product-i...nna-pid65.html
You could use a VHF/UHF combo antenna, like the Winegard HD7697P (in the 7694-7698 series) and the UVSJ would pass only the VHF signals from it.
It might be possible to amplify just the VHF signals to help Fox, because your strongest VHF signals are about 30 dB weaker than your strongest UHF signals.