The 91XG is a UHF antenna and XETV is VHF-low channel. That antenna is not made to pickup VHF channels. The sky is VHF/UHF so that explains why it worked. You are getting KFMB most likely because it is pretty strong. XETV at real channel 6 is in your fringes.
Also I owned a Sky and it was honestly overpriced junk. I scrapped it for a clearstream 2V which worked for me with my similar report in NC. To give you an idea here is my report:
http://www.tvfool.com/?option=com_wr...5134c363278f6c
I get everything down to WNCR real channel 15. The only channels that are hit or miss on my report at WYDO and WRAZ. WYDO because of trees and WRAZ I think I am just too far for a reliable signal.