Well, not really a neighbor, but my landlord/downstairs neighbor.

He's a ham too. No, we're not fighting over antenna placement, and so far, no issues, but I figure I have to ask:

If both are on HF, with antennas on the roof, how do you get around things like intermod and the like? Will the antennas being so close cause intermod to both of us? Or, am I just worrying to much?