First, antennas have no awareness of virtual channels. So let's talk exclusively about the real channels.
Per
http://www.rabbitears.info/market.ph...n=WJHG#station &
http://en.wikipedia.org/wiki/WJHG-TV, WJHG is broadcast on real channel 7 (High-VHF). The rabbitears.info data also indicates a construction permit for a facility to operate on real channel 18. I suspect the TV Fools automated process that parses data from the FCC database has picked the CP facility rather than the LIC facility in the case of WJHG. Ooops!
WECP is licensed to operate on real CH-18... so until they shut down or move to another channel, I don't see how WJHG can act on the construction permit issued by the FCC.
I've posted in the database forum... hopefully this will be corrected soon.