Mike - just thinking out loud here - what happens with your H-field noise levels if you rotate your antenna by 45° one way or the other? Do they increase or decrease? Of course, it may then get picked-up on both antennas...
Correct. The axle factory moves to both channels... Now, the Plasma used to mess with E/W antenna till I conned my neighbor into moving it into another corner, so it'd mostly hit N/S. Stay on the utility company's butt about the outdoor lighting on them dang poles. Neighbor across the street has a riding mower with bad ignition wires, kinda fun to watch him move from west to east on the H field, but, believe it or not, the E field seems to ignore it.
Believe me also... there's only one sweet spot for lowest H field within 50 ft of where I'm sitting. Took a couple of months to find it, but I did. It is nice that I'm able to orient the ferrites E/W and N/S for other reasons.
Eventually I'll get my ferrites off the cardboard and into a weathermount... I think I've found another sweet spot 6 ft off the ground inside one of the Holly trees from whence the website draws its name.
Funny, we chased EMI for months, the first few of us.... don't hear a lot from you newbies... maybe our pain helped y'all.