in the interest of being thorough... i climbed up on the roof and wound one of those silly coax chokes at the feedpoint of the antenna. i wanted to rule out the possibility of there being feedline radiation in the vertical plane. i'm still keying distant repeaters when pointed at them. i can't really tell any difference. just for reference: earlier in the year i build a moxon and noticed the same behavior. there was very little loss when the antenna was rotated horizontally. maybe i live on a forgotten indian burial mound and the ghosts mucking up my polarity.