The co-channel interference from WDGA from 333° is not too severe according to your report. You have adjacent channel interference from at least two sources, WSB @ 83° (not very strong) and the powerful signal from WUVG @ 154°. (all azimuths are magnetic)
I would try an Antennas Direct 91XG dedicated to WKTB. Another HDHR3 would provide the means to combine the independent antennas into the same HTPC network.
http://forum.tvfool.com/showthread.php?t=820
You'll need to avoid trees and other obstructions.